You can ask him if he likes you, or you can wait ing let it play out. You can always simply drop hints.
WAYS TO ASK:
"I like you." (Tell them why, that may flatter them) "Will you go out with me?"
"I think I like you"
Hints to drop
"So I like this guy, and I'm not sure if he likes me, (Say things about him, but not so specific ((EX: *what to say* He lives on the same street at me, *What not to say* ^His Address, the color of his dog, his mom's name, his favorite color, ^)) )
If you're dropping hints and you're ready to ask, golfer it! (Go for it) (A picture of a golfer giving you a thumbs up was supposed to be here, but images break often)