How do you deal with a coworker that fancies you?

I just found out my coworker fancies me which just makes things awkward for me. He was married but now he's getting a divorce. I'm happily in a relationship but even if I wasn't I don't do workplace romances.

How do you deal with a coworker that likes you but you don't like them in that way?
How do you deal with a coworker that fancies you?
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