i dont mind bein hurt not end of world
Well, you are some kind of masochist then :P It sucks to love and don't have a feedback in the same level... It sucks even more when you think the girl is really into you, and then she turns her back... (not saying it's your case)
Just back off until she leaves her bf... Not good for you, not good for her, not good for him. Or at least don't push her... Give time to time :)