Should I ask out a cute guy I see in public? And what should I say?

I go to this cafe a lot with my friends. There is this cute guy who works there. I'm thinking about making a move. I don't know his name though or much about him really.

I'm also in a complicated relationship with another guy and I don't know if we're together. What should I do?

Should I ask out a cute guy I see in public? And what should I say?
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