Why he won't ask me out again?

I've been out with a guy I really like on Monday and he likes me too (it's pretty obvious) but he hasn't made a move then. We talked a lot and got to know each other, so I didn't expect him to kiss me, we just had fun.. We still talk normally, nothing changed but he doesn't mention going out again and I wonder why.. I thought if guys like a girl as much as he seems to like me, they would want to spend a lot of time with that girl.
We are on the same college and have same classes together. So, guys what could be the reason and would you wait a while or talk about next hanging out immediately?
Why he won't ask me out again?
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