I met this girl on my first year of college. I was a very shy insecure boy who just started to live and study in a big city. I didn't have any male friends yet and she was one of the first friends I had at all. She seemed very likeable, funny and charming. We shared many mutual interests. I even fell in love with her at some point, but it wasn't mutual, and she has a boyfriend. Needless to say, I did favors without even thinking about it.

But then I saw her "other" side. Consistently and continuosly she made hurtful and cynical remarks. Of course, I thought there was something wrong with me. I didn't know what to reply to her demeaning comments and I just said "huh?" or "what?", bewildered, and later thought very hard about what she was trying to say. I have been called arrogant, overbearing, confused, socially retarded, socially awkward, socially defective. I'm not really any of these things nor have I ever been called that. E.g. one time I frowned on something and she yelled "Don't be so full of yourself". Other time I looked at her while she was playing smartphone games, and smiled friendly only to hear: "You will be a very poor parent." She frequently likes to put me down, and sometimes even mocks me, supposedly in a friendly manner. However, she isn't constantly mean - there are times when we talk normally, joke, have fun. But I'm afraid her flaws far outweigh her good sides.

Some of my friends also started to realize that. She has no boundaries and comments on everything, as private as it is, and she gossips big time - I talk to her in confidence one day, my friends talk about it the next.

Naturally, she doesn't apologize. "Oh, sorry, I was nervous that day, I didn't mean to..." doesn't exist. She's always right. When I don't share her opinion - and I must - sometimes she simply walks away, acting offended. I feel sorry for her boyfriend, because their relationship seems manipulative at the very least, so I don't know what keeps them together. She has many double standards and she is very hypocritical. Friendly teasing is forbidden, or you'll hear some of the aforementioned epithets.

I think she started to notice I'm distancing myself from her, so she found a girl friend she talks more frequently to. However, she still doesn't change her attitude, although I started to give her hints about her behavior.

Is she a bit sociopathic? Should I just stop talking to her or still pretend everything is great? Because the more I hang out with her, the more I realise it isn't.