Guys, Why would he stare if he has a girlfriend?

There is a guy who started staring and smiling at me when we were in the same vicinity. When I made the first move and said hi, he smiled even more but then ignored me for a little bit after that first interaction.

Now, we comfortably stand and chat. He holds eye contact and stares into my eyes as we talk. Aaaaand as we were talking today, he dropped his girlfriend into the conversation.

Why would he stare at me like that and then mention his girlfriend?

I find it weird that he would stare and smile if he’s taken

Guys, Why would he stare if he has a girlfriend?
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