Bi friend

Hey guys,

I’m fifteen and there’s a girl who catches my bus she used to go to my high school but doesn’t any more.  A few times on the bus we kissed last year, at first it was a bit of a joke because there were some guys around kind of laughing and joking, then I found out that she actually was bi and she liked me and had liked me for six months.  Since then I told her I actually really liked her as well but this was during the school break and she was in New South Wales so we only talked over facebook but she said she’d ask me out when we were back at school.  Anyway suddenly for no reason she stopped talking to me and I couldn’t figure it out and kept trying to contact her but she’d hardly ever reply then I found out from another friend that she had met a guy in New South Wales who had a girlfriend and was sleeping with him, they were going out.  She’s been out with a lot of guys and she’s kind of got a bit of a rep for that thing, but I like her so much and I feel like I’m putting my life on hold just drifting through until each morning when i can see her on the bus, but she hardly even gets on there any more.  I know it’s not love, but I am really really obsessed and infatuated with her and I really like her but I think this whole ‘bi’ thing for her may just be an attention thing, I know it’s not for me.  I’d never even thought I liked girls before her but I just like her so much.  What do I do?