Why does this girl ignore me?

Hey, so there was this girl who messgd me on myspace once saying she wanted to be frenz and i accepted. after tht we kept in touch thru myspace and msn, but then after a while she just stopped talkin to me and everytime i spoke to her on msn she evaded conversation. A couple of time when i tried to talk to her on msn she immidiately changed her status to LEAVE ME ALONE. I hav never said or done anythin to hurt her and we were jus becoming good frenz when she stopped talking to me. I am really hurt because of that :'(