Jealous of other girls when my boyfriend goes to the gym?

Anonymous
Hello!

I haven't been feeling too confident and secure lately but my boyfriend understands this and we talked about this. He's very into gym and working out and introduced me into this world so since half a year I'm kind of addicted to the gym. We now go to the same gym too. Apparently there's this girl there whom he thinks is hot. How do I know this? He recently showed me a text his friend sent but a few texts above was this: "I just saw X again today, mmmmmmh xD... seems like she has a bit more of a belly now though" (I think he wasn't aware of this text showing when he showed his phone to me).
His friend is single and kind of a womanizer. I don't know if I should feel bad about my boyfriend talking about a hot girl like this or if I should just see this as "guy talk"? Because now I kinda feel jealous already if he goes to the gym.
Updates
+1 y
Little update: this girl is someone he knows for a while now, a few years back my boyfriend and that friend he texted to saw her and her friend almost every day in the gym. She used to be a bit bigger but now she's working hard on her figure.
Jealous of other girls when my boyfriend goes to the gym?
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