Guys show interest and then stop all communication...confused

Recently a guy at work that I have been friends with asked me out and though he is not the type I typically date I agreed, as it turns out he is absolutely wonderful and we really seemed to hit it off. That was about three weeks ago, now all of the sudden he has pretty much completely stopped talking to me and the last time he called he confessed that he was moving at the end of the summer but would still like to date until then. The other night I stayed over at his place and he found out I was a virgin (I am not saving it until marriage or anything, I just haven't really met anyone I wanted to loose it to) and he again stopped all communication. My last boyfriend was kind of the same way, are they freaked out that I am a virgin or am I just picking the wrong guys?
Guys show interest and then stop all communication...confused
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