Why does guy coworker smile and wave at me coyly?

As in I’ll walk past his desk with another coworker and he’ll make an effort to turn around tilt his head slightly to the side and smile and wave coyly. He does it often at me. I have seen him look at me often when I talk to other people too, like he can’t help but look.

Why does guy coworker smile and wave at me coyly?
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