Why would a guy turn you down but continue to check a girl out?

So a guy and I have had mutual attraction for a few months now, so I told him that I liked him.

We got interrupted at the time, so he didn’t respond. Since then I’ve never bought it up and either has he. I’ve kind of taken no answer to mean he’s not interested, I was chasing him a bit, so got fed up and backed off.

He doesn’t really make any effort to engage, but I notice he still checks me out from the distance regularly etc, If he’s not bothered, why does he continue to do that?

Why would a guy turn you down but continue to check a girl out?
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