Advice for a girlfriend (aka the sort of thing you'd never expect to hear from me).
If you like him but aren't sure he likes you, don't volunteer your phone number to him if he didn't ask for it.
Cos if he likes you, he'd have asked for it first.
And if you think he's too shy to ask for it, what makes you think he won't be too shy to call?
Besides, if he's got your number and doesn't call, you'd fret over why he isn't. And sleep is more important than love.