bad situation...

     I have a friend, let's call her Cathy. She has a bffe, no problem with that and I'm not going to try and seperate them or sth but she is just so mean to me. She does all this stuff in front of my face, to be specific sometimes behind my back and for no reason at all she does stuff. Today, at a party where we were, she trow a glass of soda at my back and she didn't even refuse it, she just looked around doing like nothing happened. I tried to get closer to her many times, once in a while seems to respond and treat me nice...for a few seconds, then she starts again. I've asked her what's her problem but she won't answer!!!God, she drives me crazy!
   I think that because she has overweigh has troubles with being herself, the only thing she knows how to do is spread rumors and lie, she says so many lies, I don't know when to believe her and when to ignore her. I just wish she confronted me once and for all!Talk me about what she worries about and feels so threaten by me. The source of all these mean and hatred must be my friendship with Cathy . I hope she does sth before i quit ignoring her...