If he likes you enough to date you, he’ll ask you out. He may feel awkward with you because he no longer wants to ask you out or because there’s something else going on in his life that you don’t know about. But what’s more important is why [b][i]you[/i][/b] feel awkward around him. I think you feel awkward because you’re angry that he isn’t asking you out on a date.
My advice to you is to focus your energy elsewhere, and consider other guys instead of him. If he ever does decide to ask you out, he knows how to reach you, but in the meantime, don’t sit around waiting for him. Get out in the world and switch up your life outside of work so that you’re in new situations where you’ll meet new people — and among them, new men, any one of whom may be Mr. Right. 🙂