CANYOUBELEIVEMYFANTASYGIRLISAG… DANCER?!???! i want this girl sooooo bad what do i do?

shes my friend. like we flirt and talk about deep stuff and she just has a great fun personality. shes gorgeous. shes mature(in attitude not age lol) i guess sophistaicated is a better word. cly? idk you get it. the problem is she has a bf but she keeps complainging to me how stressed she is from the relationship because she thinks hes not into her anymore. i knwo hes not and hes just using her. i cant tell her that. but i do kinda want them to stop... like im just afraid we have no chance because i went out with her best friend and i mean were still good friends but...idk. i just want to make her life better. she always seems so saddened like she doesnt have a real man or seomthing. like i want to be in her life. like i want to make her hapy and feel good and do anything for her. i want a real relationship and i feel like she is the one to do it with. like im going crazy for her. i dont want her bf to get mad at me though and i think she might have a secert crush on me too because we kinda flirt a bit and she told me i was hot... but help what do i do?!?!?!