You're not a whxxx. Since they get paid to do what they do. And you're not a slut, since you aren't banging him.
You are allowed to like someone.
That said. He's too old for you. Even if you get along now, later you most likely won't.
Be happy he's cute and you have fun with him. And move on.

thanks for the helpful comment. I'm not a whxxx, I just happen to like a guy who has a girlfriend. I won't do anything about it because of the girlfriend so can you really call someone a whxxx because of their thoughts even if they dont act on them?