Why would a man not stop asking me out even though he has a girlfriend?

Every time he comes here with a business trip, he invites me on a dinner…

I never go, cause I know he’s taken…

But the audacity… It’s really getting me as to what the hell he wants.

Updates
1 y
Update:
He has a very loving and sweet girlfriend, she obviously loves him a lot…
Now he asked me “Are you still single?”
And I returned his question and asked “Are you still taken?”
And he said “No, she asked too much attention and I was too busy with work.”
And that idiot hid all his couple photos from me. I already saw them before… Such a liar. How do I confront? I just feel sorry for that girl
Updates
1 y
Okay, so…
I replied him “ I have always been curious why do men cheat on their wonderful girlfriends… So, would love to know why? 😊 You might know 😘” and he blocked me. Lol
Why would a man not stop asking me out even though he has a girlfriend?
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