What is it about men who aren't ashamed to stare too long at a woman's breasts while he walks and he keeps getting closer as he walks past you?

I was walking through the supermarket. I have a larger chest, but I tend to cover up and wear loose-fitting shirts. As I glanced from left to right, preparing to enter the supermarket, I noticed a guy staring at me. At first, I thought he was just surprised that I was about to cross in front of him. But he kept staring for longer and even moved closer to me, though he seemed to be walking toward a car, almost as if he was going to walk right into it instead of staying on the path.
He continued to stare, and it became really awkward, so I looked at him as if to say, 'Hello?', but he just didn't care, kept looking and then looked away
What is it about men who aren't ashamed to stare too long at a woman's breasts while he walks and he keeps getting closer as he walks past you?
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