Guys, Why wouldn't he tell me he has a girlfriend?

This guy is 23 but likes talking to me. He stayed in Manhattan and I jokingly told him he could've gotten any model over there. He didn't say anything and said he went to a bar with his friend instead. Later I found out through other women he has a girlfriend. Why don't guys share when they have a girlfriend? I'm kinda interested in him but it would've been nice to know sooner.

Guys, Why wouldn't he tell me he has a girlfriend?
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