Why does my boyfriend talk about other girls?

Beccaasaar
Sometimes my boyfriend talks about other girls either his exs or just girls in general like this girl at the store that comes over and talks to him, he just randomly brings up stupid shit, should I just shut him down when he does that and say I don't care and I'll never care, but why does he do that is he trying to get a reaction out of me. Also a side not the first time he did it I flipped out bc I was so insecure about myself and I now came to realize that I'm not and I figured my insecurities out.
Why does my boyfriend talk about other girls?
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