He lost interest in 2 days?

This guy started showing interest in me at the gym. (He's maybe 28, and I am in my 30's but look about 30). He's the one who initiated it, by hovering around me, while he is quite shy. He continued to hover around me in classes, initiate small talk about the classes, and would always end with a compliment with how I did. After class, he'd catch me by the lockers, and he might not say much but stand there, looking very nervous and give me a fist pump. I'm quite shy around guys, but I would engage back.

Finally I was early for a class, and walked over to him, while getting ready and initiated a more lengthy convo with him. I asked him how his week was going. I made a couple of jokes about sparring. We were smiling sweetly at each other throughout. I asked if he wanted to be partners in class, he thought I meant if he had a partner (girlfriend) and he said, No, all bashfully. I stepped close to him, clarified I meant for the class but he was partnered with his male friend. After the class, he went over to me as I was leaving, he looked really happy and gave me a fist bump. I thought all was good...

Couple of days later, I see him at sparring but the class was really busy. After I sparred, I walked over to him, gave him a fist bump, and was going to chat with him, but he immediately looked away... And he just kept watching the sparring. He didn't try to talk to me at all during that class, or the next class I saw him in. But at the next class, he did talk to another girl (who has a boyfriend). After that class, I gave him a fist pump and said he did a good job sparring that day, he actually looked at me this time and said thanks nicely.

I can't think of anything I did, except maybe he thought I like other guys. I didn't approach any other guys, but a few guys in that busy sparring class, were talking to me briefly in the beginning and it may have looked like flirting from across the room? Or maybe I'm too sweet and we're both too shy together? I don't know, lol.

He lost interest in 2 days?
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