Overhearing boyfriends convo

Long story short my boyfriend is in prison and calls everyday . I was at work so I ended up calling his cousin on 3 way , muted the phone and went back to work . I picked up the phone to see if they was still otp and overheard my boyfriend ask his cousin if his girlfriend have any friends for him ? I’m hurt about this and want to bring it up but really don’t want to because I don’t want him to think I was listening in on his conversation.. mind you a few months ago he was on 3 way with a friend and I was listening (not intentionally. I had headphones in and was carrying my son to the bus stop. I didn’t have the hands to take them out Frfr) but anyways the friend said he was trying to talk to another friends sister . When I approached him he said he let his friend use his fb and it wasn’t him . I just feel like why is it that everytime I do pick up the phone it’s something I don’t like and it’s signs that I need to leave . . We’ve been together since 15&16 so I feel like it’s one of those things where he didntget to go be a hoe and experience stuff .Please don’t comment that he’s in prison I need to leave him anyways .