How can you tell if a married man likes you?

I'm 33 Female and single I'm not hot or pretty but I am hard working and nice and I would be a good partner I'm just hideous people think I'm a man oftentimes but I'm not. Regardless, I'm kinda going insane cause no one wants me (I don't blame them) and this married guy at work I noticed was hanging around me it seemed and after I said something flirtatious in front of him but not directly to him after that I noticed he was talking like me and I felt like he was trying to appeal to me and he's way too cute for me. We have never spoken before but there's just been this silent thing and I don't know what to think.

How can you tell if a married man likes you?
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