Does my guy friend have a crush on me ?

Okay, so My guy friend is already going out with a girl named Becky, But he told me he likes me.. but that was awhile ago, befor they were dating. Me and him were on my friends trampoline the other day. And we were play fighting (He kept tickling me and stuff) I think he ment it to be flirting.. But.. even though he has a girlfriend.. i can't tell. So, do you think he likes me ?