Married man has a crush on me?

A married colleague has a crush on me and has done for the most of this year. It’s really cute in a way and quite flattering how I’ll catch him looking at me, and how he’ll try and show off in front of me and sometimes get shy.

Nothing is ever going to happen here but it did get me wondering, why does he torture himself? He always tries to make conversation, sometimes turns up places where he knows ok going to be, looks at me ALL the time.

Why would a guy torture himself in trying to get closer to a woman he can never have or make a move on?
Married man has a crush on me?
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