Why would a male bartender keep looking at me whilst I’m dancing/signing with my friend?

I mean I was dancing and signing along to cardi b - UP with my male friend there I was just dancing singing and having a good time and he kept staring with his eyes locked on me I thought it wasn’t at me but my friend noticed it too he just kept watching between cleaning glasses

Why would a male bartender keep looking at me whilst I’m dancing/signing with my friend?
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