I like him, but I think he likes my best friend?

There is a guy I've liked for a while now, and for a while I thought he liked me too. But the other day my friend and I were talking, and she said that he's hinted a few times that he likes her. Then I told her that I liked him. She is not interested in him since she has already got a boyfriend. She felt really bad that he might be possibly interested in her and not me since the same thing used to happen to her with her old best friend(every guy she liked, her best friend dated). What am I supposed to do? I really like this guy, but I don't want to still like him if he's interested in my friend.