Thanks for your reply.

Yes, that's what I also thought, maybe I exaggerated with sociopathic but she is toxic as toxic gets. She simply drained my energy to the point that I really wondered it's all my fault. I was such an easy prey, insecure, introverted... It makes me somewhat angry that I realized this and reacted accordingly only now, but it could have been worse. I've seen some of her friends (not our mutual) and I can say they mostly share those characteristics and rarely argue with her.

I will 'try' to talk to her and get her to change, but I don't think I owe her as much. What bothers me is how do I make my other friends (who are also somewhat irritated by her behavior, as I said) understand that I really don't want to be near her anymore. They don't know even half of the things she did to me, so they might not understand why I try to totally avoid her. Then again, I wouldn't like to be the party pooper. Or do you think they will slowly realize this with time?