If he doesn't ask you out now that he knows you like him then don't bother with him anymore.
Congratulations on having the confidence in yourself to ask him. Now, don't let rejection whittle away at that confidence because his rejection is just a lost opportunity... HIS lost opportunity, certainly not yours.
Well done, now relax and view this as no big deal. Know that you're the prize and if he's too stupid to see that then he's not good enough for you.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion