A guy tried cheating on his girlfriend with me...?

I'd say we're friends but not great friends. He's been dating a girl for about a year and says he loves her very much. He told me he likes me a lot and he tried to kiss me multiple times and of course I stopped him every time. He said he's planning on staying with his girlfriend but if they ever break up, he would be interested in dating me. I kind of got an icky feeling because of this and feel used. What would you do in this situation?