Can't figure out my gym crush behavior, please help?

GreenEyesBrownHair
I have a crush on one of the trainers in the gym. There was a long period of eye contact until one day I said "Hi" to him. After a few minutes he came up to me to ask me something and later he offered his help to unload the pole I was using for hip thrusts. I said thank you and we exchange our names. Since that moment when he sees me at the gym even if it's from the other side of the it, he waves and smiles at me but he dosen't come up to me anymore and for the rest of the workout when there are eye contacts, he's just like 😐. He confuse me very much. One day I came up to him to say hi and we were working on the same machine in turns and when we were sitting next to each other during our breaks from sets he didn't started any conversation and neither did I since he had his airpods in and I thought I might bother him. The first time I said Hi and he came up to me twice i thought this thing will kick off but now i don't know...
Can't figure out my gym crush behavior, please help?
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