What do you do if you like a guy and he says he likes you back but he hasn't asked you out?
Ask him out, or he might not be ready to be in a relaitonship. Maybe he's waiting for you to ask him out.
You should invite him out instead. He may be a little shy, and scared that you will say no. Alternatively you could write him a note asking him to invite you out, and suggesting a venue or activity you would like to attend.
smile him and ask him out ...