Guys, Gym guy checking me out or not?

Whenever I go to gym, I find myself looking for him. And when he's there, sometimes he'd try to workout/exercise beside me, but not always though. And we sometimes have eye-to-eye contact for like 2-3 seconds. I get too shy, so I stare away.

He has approached me twice before, to ask if we could use the same machine alternately. I agreed, but we didn't talk, no conversations. I mean, what am I supposed to say? He didn't ask me any questions either. But after that, nothing. He didn't approach me again after that but I see him looking at me sometimes. Am I overthinking?

Guys, Gym guy checking me out or not?
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