I like a dude at my gym and I don't know what to do anymore?

There is this man who works at my gym that I became instantly attracted to at first sight on my very first day at that gym. We have had very brief conversations, smile at each other sometimes and say hi and meet each others gazes often but since he works there he obviously is friendly with everyone so I doubt it means anything. Some days he shows up at the gym with this girl and I don't know if it is his girlfriend, I still don't know and it's been almost a year. I feel insanely guilty and bad for even looking at him or thinking of him in that way if the girl might be his girlfriend. I even changed workout times to be mature about it and try to get over him and not have to see him but it still didn't work and I only seem to think about him more. Now I feel so awkward and shy and scared that he will know. I feel like I should not even be looking at him or having these thoughts because he works there and might have a girlfriend but I can stop thinking what if...

I like a dude at my gym and I don't know what to do anymore?
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