Do guys often mention the number of girlfriends they had in a casual conversation with a woman?

I AM taking private dance classes for about 4 months. My instructor is my age and we often talk during breaks. I enjoy our conversations as topics vary from hobbies, work, the films/things we like and dislike, small addictions, etc. but recently we started talking about weddings and relationships (it is his job to prepare wedding dances for couples) and he mentioned the number of girlfriends he had until now. Would a guy give such information if he didn't like the woman? I AM an introvert and I think I have a crush on him, but I wouldn't like to do something uncalled for that would make the both od us awkward or would force us to end the lessons.

Do guys often mention the number of girlfriends they had in a casual conversation with a woman?
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