What does it mean when you are in a grocery store and a guy in the next line behind the cashier keeps looking at you?

I looked at him and he kept looking at me so I looked away, then after a minute or so he was looking at me again even while I was walking away? It isn't really important but is it a good or bad thing lol

What does it mean when you are in a grocery store and a guy in the next line behind the cashier keeps looking at you?
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