Ughhhh help me

Ok so I used to be really good friends with this girl but we got in a fight and barely spoke for 2 years and we have finally started to become friends again and I am friends with this guy and she went out with him (dated him) for a while but then he broke up with her cuz he “likes someone else” and I think it’s me cuz he is now nicer to me than he used to be and he always smiles at me and he texts and calls me a lot and I like him but the girl that I am just about friends with again still likes him a lot and I know if I go out with him then she will hate me again. What should I do ??