Typical Love Problem...HELP!?

first of all how old are you? how did things go downhill? why where you all unofficially together? she might of just looked at you as a good friend maybe with benefits... not to burst your bubble but smiling and saying hi isnt a sign that she wants to be with you. dont tell her anything about her new boyfriend unless you can prove it bc odds are she will confront him and he will then confront you and that might not be too pretty. i really wish i knew a little more detail about your situation. but pls do not hurt yourself...physically or emotionally...just ask her how she feels tell her how you feel...and take it from there. dont turn into a stalker girls dont like that and dont let her know your desperate. i am a girl and we might not admit it but we like guys tht dont want us...its a dumb game but it works...if she says she still likes you or whatever but she has a boyfriend...then act like you dont care either way...dont tell her you will wait on her...but still be there for her if she needs you even if its to talk about her boyfriend problems with you....start acting like your interested in another girl...maybe talk to her about your new girl....maybe even find you a new girl....but bottom line if she has feelings for you and her boyfriend isnt a good guy then she will for sure start chasing you if you act like your not interested in a relationship with her anymore...good luck