I HAVE THE SAMME PROBLEMM!

we used to be so close, but she didnt even tell me she has a boyfriend !
and when i visited her at school she just went on the some other ppl n just talked to them and ignored me like she sees me everyday....she doesnt tell me nuthin no more... WHAT SHOULD I DO, PLZ HELP GUYSS !><..SHE USED TO BE MY BFF....but now...i dont know=/