A classic example of why I don't particularly enjoy getting close to others.
Sometimes, people can be "clingy" and unfortunately it's hard to see at first until you really get to know the person. I have to admit, hearing about peoples sex life is something I don't enjoy, either. Again another unfortunate trait of humans...they like to brag.
If you built up resentment towards her, I don't see any reason why you should try to be her friend. She seems like she is doing nothing more than bringing you down. Tell her directly that you want to have no more contact with her. It's better to end the friendship earlier, than drag it on for years to come, only for her to find out one day that it was unwanted and become even more hurt.
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I = Vegan!
Animals = Friends.