<human>: Can you provide a brief overview of the text?

Background: We'd gone on a few dates before, and had done sexual things in the past. One night, I had quite a lot to drink and the next morning, I woke up completely naked. I know I made out with her a bit earlier the previous night, but I cannot even pull together any bits and pieces of actually sleeping with her. I feel incredibly angry and hurt, because she was apparently sober enough to remember the entire night. 

I've been friendly enough with her since I don't want to stir anything up between our mutual friends. This weekend we were supposed to be attending a sexually-charged party, and my best friend, who knows about my dislike of her, was going to act as a buffer. However, due to her work schedule, she wasn't going to be able to make it and I'm not going to guilt her into calling out of work to make it. Because of this, I bow out of the party because not only do I feel uncomfortable getting drunk around this woman, I just plain don't like her at this point.  My social anxiety makes it difficult enough to go to any sort of party under the best of circumstances, and the sexual themes were making it more of a stretch. I simply do not want to feel like I'm on my guard the whole night.

I gave my best friend permission to tell her friends why I was so uncomfortable with this other woman after they asked her why I wasn't going anymore, and now I feel awfully guilty because I've been acting like I'm completely fine with her this entire time and my strong dislike probably seems very out of the blue to them. I don't want them to feel like they have to play favorites, but I absolutely cannot stand to be around this woman at this point. My close friend has essentially cut the other woman out after tonight, and I feel like I dropped a huge drama bomb and feel awful and guilty about everything. I don't want to issue an ultimatum of "her or me" and force them to uninvite her or stop being her friend, but I can't keep up the act of being friendly around her anymore, though.
<bot>: I feel guilty about potentially making some of my friends feel like they're having to choose. Am I overreacting?