you have my sympathy... that sucks! Well I can certainly relate to such nonreciprocating feelings (mainly throughout high school for me). My best advice is to try not to dwell on it any longer. If you feel like she owes you anything, try to decide exactly what that would be (apology, or explanation, or anything). Then, talk to her just once more, about that. If not, then try to move on. Hope things get better.