My roommate doesn't like me but she wants me to be nice and friendly to her?

or she'll get mad. what the h*ll is wrong with her? why am i suppossed to be nice to her when she's b*tchy and rude to me. i know this doesn't exactly belong in this section but i know there's something seriously wrong with her though processes why does she act like that? does she need validation for herself or something like that?