Why doesn’t he openly check me out anymore but I see him checking out other girls now?

It’s probably my fault. But a guy at my gym I like I wasn’t really reciprocating to his compliments and stares, sometimes would outright not look at him, and now he just glances at me but doesn’t full on stare or attempt to talk to me anymore. I don’t think I did anything wrong. But he’s like kind of avoiding looking in my direction now. If anything he glances or sometimes looks me up and down.
I see him checking out other women though. I don't know he complimented me twice and nothing really came of it. Can I still go say hi?
Why doesn’t he openly check me out anymore but I see him checking out other girls now?
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