Was gym crush jealous?

I talk often to a guy in the gym. We flirt but he has never asked me out. Today another guy opened a door for me, smiled and said have a good workout. My gym crush became visibly agitated, said “he is trying to be me”, “he is moving in on my chick”, and “has he ever told you to have a good workout before”. Why the jealous response if he hasn’t even asked me out yet?
Was gym crush jealous?
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