I’m glad that you were happy with how you resolved it but perhaps for OP, irrespective of the reason for his coldness and change of behaviour, she just doesn’t want to engage further - which is fair enough and IMO a wise decision.
Personally I believe he knew exactly what he was doing with the lack of eye contact, short responses and rushing out to the gym.
But even if say this grown man genuinely doesn’t know this behaviour is offensive to many/most women, that’s a massive him problem that Op is under no obligation to sort out/talk about .
Too many women are roped into being free therapists for men they’ve just met.