[UPDATE] My (20F) boyfriend (21M) of a year and a half drunkenly kissed my friend (21F)

Original post here: https://www.reddit.com/r/relationshi...ar_and_a_half/
I know my original post didn't get super popular but I thought I'd give an update 5 months later. I ultimately decided to forgive both him and her, which turned out to be a huge mistake!
School started again a couple weeks after this happened. I went over to his apartment when I got back to school, expecting things to be normal, but instead he sat me down and told me that he'd been thinking things over and didn't feel like we were right for each other, so he broke up with me. I was completely heartbroken and told my friend (the one he kissed) everything that had happened.
She was so supportive and helpful during that time, telling me that my ex was awful and helping me move past him. She also started telling me about a new guy she was dating who she was super excited about. She would talk about how it "just felt right" with him and how amazing the sex was. As her friend, I was happy for her.
I still had some stuff of my ex-boyfriend's that I needed to give back to him, so about a month after the breakup he came over to my apartment and picked everything up. After grabbing his stuff we talked for a little bit, I asked how he was doing and he told me that she and him had actually started dating a few days after we broke up and said that he was "much happier" with her and she was his "best friend". I kept my cool and said I was disappointed but hoped things worked out for him. I was surprised but at the same time not shocked.
So after my ex-boyfriend left I texted my "friend" and asked if the new guy she was dating was my ex. She admitted that my ex was her new boyfriend, and she also said "I wish I could say I regret it, but I honestly can't say that, I really like him and I just wish it had been done differently". I replied "thanks for telling me everything but please don't talk to me again".
I blocked them both and began the process of moving on. I blamed myself for the longest time and cried for days straight missing both of them. I also tried to spend time with my other friends and went to the gym a lot. It was a slow process but one day you just kinda wake up and realize it doesn't hurt anymore. It's been 5 months and honestly, I'm happier than ever now, I'm in great shape and I don't miss either of them. I'm glad they are out of my life now.
The number 1 thing I learned is that FORGIVING THEM WAS A MISTAKE. If someone cheats on you, please think long and hard before forgiving them!
TLDR: forgave friend and boyfriend, they started dating behind my back, I blocked them and moved on with my life and am happier than ever!


Source.