Me [27 M] with my former crush/best friend [27 F] now years later she wants me and I don't feel the same

I was pretty much a stereotypical "good guy" in high school and college, so my luck with the ladies was not what you would call great. I was always and I mean always hung up on my friend Tammy.
We were friends and obviously I had feelings for her and she had feelings for me, however what each of our feelings were was the extreme opposite of each other. I loved her and she loved me as a friend.
The usual pain and misery followed. I would act like a beaten puppy every time she got a new boyfriend. She of course loved the bad boys and type A jocks.
Long story short after a few years sitting by watching her live her life I decided that I had to get a life of my own. Just in case you are wondering, yes I let her know how I felt. Not when she was with someone, but when she was single. I got the "that's cute Mark, now what do you think about Eric over there I think he's fine".
I kept in touch but life moved on. She went through one bad relationship after another. She got married and was with this guy almost 3 years. However he was physically abusive to her and he ended up getting another woman pregnant.
So lo and behold after years of waiting on the sidelines then getting out of the orbit of her life I am approached by Chris one of our mutual friends about getting with her. She tells me all of the troubles she has in her life (I do feel very bad for her because I am her friend still) and that she wants me (she meaning Tammy by way of Chris) to ask her out. Now at first my mind actually started considering this, I mean this was my entire teenage and early 20's fantasy come to life. But then Chris said something that slapped me right out of this.
She said "Tammy has learned her lesson with the types of guys she dates, she has had her fill of *******s who only use her and wants to settle down with a good guy like you".
I have no idea how to take that. I mean basically it says to me that while Tammy doesn't find you attractive or sexual she really would like to settle for you because you won't punch her when your mad or high on Meth (bonus, her ex is a meth addict).
I guess I'm a grade A ******* now because instead of jumping at that offer I actually was offended. I just told Chris that I consider Tammy a good friend but those feelings left me years ago.
I thought that was going to be the end of it. But instead I get a very belligerent text from Tammy asking me who I thought I was? She stated that she new I still had feelings for her because those just don't go away when I had them as long as I did.
Somehow either she misunderstood or Chris misrepresented my answer to her. She feels like I am calling her a lowlife.
Now I admit, honestly I have no desire to put up with the "I'm broken I need you to fix me" attitude that I got from her but I also don't think anything less of her other than honestly I feel like I waited and was respectful when i was young and now I've moved on and she expects me to drop everything now that she wants it.
I guess what I'm asking is, am i wrong to feel this way? I've moved on. I still like her as a friend but that is all right now.

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tl;dr: Friendzoned in high school, after letting go and getting on with my life crush now wants to go the romantic route after her divorce. But because she is tired of being with "*******s who use her". In other words I'm the "nice guy" again and now this is what she wants but i don't


Source.

Sounds like you're all still in high school. Why is a friend in the middle of all this? Yall are adults, talk like adults do. If it was you two speaking about this you would know what Tammy meant and she would know what you meant and maybe no one would have gotten offended.