Should I tell him I like him or forget it and move on?

Since December I have had feelings for a coworker, at first we flirted and talked, and it seemed to be going well. We had lots of conversations as we are both talkative, conversations that would last hours talking about anything from personal problems, past relationships, and life in general.
Thing is nothing has happened from talking to him, We have hung out a few times outside of work and still nothing and its been months. My freinds tell me to forget about him since if he liked me would have asked me out buy now.
I have been trying do so buy going on dates with others, but for some reason I seem only too be intersted in him.
Is there any advise anyone can give me, or has this ever happened to anyone else, should I tell him I like him and how would I do this
We used to talk all the time, but since hes now a shift supervioser I havent gotten a chance to talk too him in months, I work with him tonight should I just tell him I like him or would that seem to weird, since we havent talked in two months