So my gf dumped me, lil help?

Ok so here we go, ive just moved to a new school were i am kinda poular with loadsa girls (apparently) at one point he girl in the yr above (yr10) which is 15 yrs old asked me out, am 14, i sed no at first and a few days later i decided to give ti a go. My friends kept tellin me i was too good for her, but she was kinda fit i didnt realise why EVERYONE hated her so much. A couple weeks later school ended for the six week hols and altough we live real far apart i tried hard to see her when i could, cinemas, town and just general chilling. We must of made out 100 times one day, she kept telling me this could be special and we could last, well one day she headed of to manchester to se family and i headedup derby to see family..we talked into the morning, 3am several times with 3 hour phone calls every night, we talked about everything, she told me things shed never told anyone before, her illnesses, and suicide attmepts..Then she thanked me for staying by her as most boys just ran away when they heard these things, n were just there for . She stopped goin on msn much and we didnt speak often, today i logged in to see her personal message "Am jamies horny lil pixie" great...........IM NOT JAMES!!?? I bet hes some yr 11 **** o sumet but idc tbh, just dont get y se finished me, i was real upset i thought ths was gnna work so i cut my arm up and got pissed, smashed a couple of things and cried all day. Any help...advice??? or jsut sum1 to talk to..ive been staring blankly at my comp screen for 5 hours to see if she logs in and i bet i wont get 1 minute of sleep tnight. Thanx in advance