He has a girlfriend. Does he like me?

This guy I work with compliments me, looks out for me, stares other guys down when I talk to them, speaks in a soft tone to me, teases me and likes to make me laugh. While I think he is a very nice and attractive guy, I'm starting to feel uncomfortable because I'm beginning to think he wants me. Last time while I interacted with another guy, he walked close to me and whispered in my ear, playfully teasing me again. I was overwhelmed by this and left work early. I feel bad for his girlfriend. What do you think and what should I do?

He has a girlfriend. Does he like me?
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