Guys, why do you hide that you’re admiring a woman?

I work at a grocery store and a guy could be standing right in front of me waiting in line or shopping and it doesn’t seem like he’s looking at me at all. Out of nowhere, I was approached as I was walking on another side of the store.

This guy didn’t look my way not once and he mentioned that he thought I was beautiful? I was so confused. How is that even possible? Many instances like that occurred and I always wondered how are guys so good at doing that?
Guys, why do you hide that you’re admiring a woman?
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