Guys, What does saying hello and winking mean?

This guy comes into my work quite a bit. We have small talk conversations and know each others names.

Lately he's been winking at me when he says hello, but only when my coworkers aren't looking. Does this have any specific meaning?

Today he also told me to have a good day and called me Hun as he was leaving...

I think it's quite obvious I have a thing for him, but I could be wrong.
Guys, What does saying hello and winking mean?
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