My (27F) bf’s (27M) new female friend (23F) did something awful to me.

I tried to find my previous post about this but I think I must have deleted it. My boyfriend and I have been having problems lately because of a new female friend that he made, Katherine. In my first post I mentioned how we have been together for 10 years and live together.
His new friend from school quickly became his best friend from the program he is in. I was feeling really uncomfortable about their friendship because my bf told me how she was very touchy with him. She'd put her hand on his leg in the car, rest her head on his shoulder in class, link arms with him while walking, touch his face to show how cold her hands were. She also sent him hearts a lot in her texts. She also has a boyfriend who lives a few hours away that she sees on weekends.
My boyfriend told me about all of it because he was unsure of how to feel about it. I told him that it sounded like she just enjoyed getting attention from him. I asked him to set a boundary with her. I understand some people are touchy. I don't think I should have to be uncomfortable with their relationship because "that's how she is". And a good friend should be able to respect a boundary. At this point they had only known each other for six months but the touchiness started very shortly after they met. He told me that that would make things awkward between them to bring it up to her, and that he didn't want to do that and kept accusing me of wanting him to stop being her friend. I never asked him to do that and told him many times that's not what I wanted.
So obviously that caused a lot of strain in our relationship. I felt misunderstood and disrespected, and he felt that I was being jealous and controlling. Ithink what started happening was that Me focusing on their relationship so much was pushing him away, and he was getting closer to her at the same time.
We were on the verge of breaking up, neither of us were really sure if that was the right decision because we both love each other very much, and the good qualities that he has are things that I know are rare to find in people. So we decided to keep trying to work on us.
I had met Katherine once before and tried extremely hard to be open minded and give her a fair chance, regardless of feeling like she didn't respect our relationship. She seemed very outgoing and I got a vibe from her that she seemed fake in the way that she liked to people please, if that makes sense. Like she tried to act a certain way depending on who she was with.(we were in a group of like 8 people that night). I didn't tell my bf that and I told him that she seemed nice enough. Which was true, and I was trying to give her a chance.
After that, the flirtiness and the touchiness continued. My bf and I went through another cycle of the same thing, almost breaking up, deciding to stay together.
He invited me to come to his friend's apartment about 3 weeks ago. It was another friend from school that I had met and liked very much. She lives with her bf and we had been on double dates a few times and I really liked hanging out with them. So we were supposed to go to their apartment and Katherine would be there too. It was supposed to be a way for her and I to get to know each other more and hopefully become friends so that she could stop being a problem for me. She knew this because my bf had told her before that we have problems because of her. (And to that she told him that he shouldn't have to deal with that kind of jealousy).
Anyway that night we were all drinking. I ended up telling Katherine how I didn't like that she was so touchy with my bf. Then she spent the whole night talking to me, really trying to convince me that My bf is "like a brother" to her. She just kept telling me that all night. That I had nothing to worry about and that he loves me. (Not that I needed to hear that from her). She seemed pretty convincing. I was actually having a pretty good time and thought that maybe I had misread her. I ended up going to sleep first. As soon as I fell asleep Katherine came on to my bf. She got up close to him and tried to kiss him multiple times. He asked what she was doing and kept physically pushing her away, she said "you know what I'm doing".
She said she's liked him for a very long time. She told him how smart and handsome she thought he was and how she wanted to be there for him because his mom passed away when he was younger and he has problems with his dad. She kept insisting that she knew he liked her too. He said he had confusing feelings about her. He tried to rationalize with her even though he was really drunk. And she even admitted to giving Him the most alcohol, like she was trying to get him to cheat on me. He told her that she had a boyfriend and he's with me and that what she was doing was wrong.
Then she physically got on her knees and kept saying "let me suck your ****" and kept trying to grab at his belt. All this time I was laying on the air mattress 2 feet away from them, passed out. The ONLY reason nothing physical happened is because my bf wouldn't let it. The friend whose house we were at was sleeping, but her bf happened to see and hear a lot of their conversation and when he saw Katherine on her knees he called My bf over to take him out of that situation. At that point Katherine was crying and saying she felt really rejected. She went and threw up and then cried herself to sleep.
I only know about this because my bf wanted to be honest with me. The next morning, I had no idea that this had all happened. Katherine was acting completely normal and so was my bf. They were talking normally and joking around and I had no reason to think anything. Katherine ended up driving us home because we both felt sick and on the ride home she was touching his face and I remember thinking they were being a little flirty while I was right in the backseat, but basically shut down the feeling because I didn't want to get myself jealous when that night was supposed to have the opposite effect. We got home and I took like a 3 hour nap then got up to go to work. My bf was acting extremely weird and wouldn't tell me what was wrong until I got off work and he told me everything. He said he's always been attracted to her but swears that he never had feelings for her while they were friends. But that when an attractive girl that he liked as a friend threw herself at him, he said he felt his feelings change in that moment, but didn't let anything physical happen. I believe him.
I need to vent to someone because I have so many emotions that I don't even know what to do with them. I'm hurt that he had (has?) feelings for someone else. Especially someone who did something so ****ed up to me. I understand being attracted to other people. And I don't take it lightly that even though he was drunk he didn't let anything physical happen.
I'm angry and humiliated that he didn't get us both out of the situation and shut it down the moment it occurred, but instead let me be friendly towArds her the next morning. He even still rode to class with her the next day because he wanted to "talk to her" about what happened. I went the whole day assuming he probably at least kissed her. He said nothing physical happened and I do believe him. But I'm angry that once again he didn't seem to care that I was being disrespected.
I feel upset that Katherine is such an evil person and I have no one to talk to about it. After their talk on the car ride to school my bf told her they couldn't be friends anymore. She didn't understand why. She ended up just going back home to her bf for Christmas break and probably told him nothing of what happened. She even told the friend whose house we were at that the only thing that happened was that my bf told her that he liked her. Which, sure, isn't a lie but that's not exactly what happened. She's a liar. She's malicious and manipulative. I'm so shocked that there are actually people like that in the world. To be so insistent on spending the whole night trying to convince me that nothing was going on between them only to throw herself at him thhat same night just seems ****ing evil.
I feel extremely confused about what to do next. My bf has been very honest with me. I know that he would never physically cheat on me. I do think though, that this whole situation spiraled because of their closeness and also that he confided in her about our relationship. I think that she probably enjoyed knowing our relationship was struggling and felt powerful knowing her was attracted to her and close to her emotionally. (Not because he told her but because she is just a very pretty girl. Apparently she's never been rejected before). I can't help but think that if I had been more willing to get to know her before, and made my presence known to her, and was less jealous of a person, this might not have happened. And I also feel that if my boyfriend had set a clear boundary, she wouldn't have even considered coming onto him because he would have let it be known early on that there was absolutely no way that he would ever even consider doing anything with her. She shouldn't have ever thought it might have been a possibility.
I want to move past this and I want to be with my bf still. But he still stands by his opinion that nothing about their friendship before this was inappropriate. That scares me. I've wrote a letter to her. I'm big on writing out my feelings. I debated on sending it to her, but she seems to have no remorse or even embarrassment for what she did so I really think it would be pointless to talk to someone who lies and says whatever she thinks people want to hear. It made me feel a little better just to write it out anyway.
I wrote a letter to her boyfriend that I also decided not to send. I've met him once. I really think he deserves to know what a **** he's dating but I'm not trying to give her any reason to somehow be involved in my life anymore. She'll **** up her own relationship eventually.
I guess I’m wondering how to process all of these emotions I’m dealing with, and move past this. I know it’s not fair to my bf to be angry with him when we’ve decided to stay together, but I’m just having a hard time.
TL;DR: I felt that my bf’s new female friend was being flirty with him, but he didn’t want to make things awkward by setting a boundary with her. She threw herself at him one night when we were all drinking and I want to be able to move past my anger about the situation.


Source.

Go on either Maury or Springer, your pick....

Oh hell no!!! Sorry honey, but your bf isn't innocent in all this. He had feelings for her, accused you of being jealous, continued his "friendship" with her knowing it was causing issues between yall. And then after she takes advantage...which was obviously gonna happen since he told her you were jealous, he admits to his feelings and attraction? Nopeeeee. He knew what he was doing the whole time. Let another woman put her head on my mans shoulder...I'd knock her teeth down her throat and kick him to the curb for allowing it.