Why would I dream of someone I have never talked to?

There is a guy I see everyday, I do think he is attractive but he seems to keep his distance and I assume it must be because he is married or has a girlfriend. Anyway, I have avoided this guy in every way possible. Turns out this is the fourth time I dream of him. I don’t even think of this guy through out the day and nevertheless when I’m going to sleep. It’s just really weird to me that he keeps appearing out of nowhere in my dreams. Any idea why this would be?
Why would I dream of someone I have never talked to?
Why would I dream of someone I have never talked to?
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