Don’t like my fiancé right now

So this is more of a rant cause I have no one to talk to...last night I hopped in the shower with my fiancé which we do often and I don’t even remember what the conversation was but then he brings up an ex gf...while we are naked in the shower! After that I just saw red really. He thinks it’s normal to still be friends with pretty much all his exes and apparently talks to them on and off like this one in particular he said told him happy birthday. I know for a fact after looking this girl up that given the chance she would hook up with him again. And I know I sound crazy but like any guy in my life who ever touched me sexually would do it again and I know this because they tried so they can’t contact me. Idk maybe if he didn’t bring it up while we were in the shower I would be less put off by it but now he’s at work and I’m just going to be over thinking all day while I’m with our 19 month old...maybe I should go back to therapy. I just feel so disrespected and he doesn’t understand why. Maybe next time we are in the shower I’ll talk about my ex and see how that goes over. It’s always a double standard with him I know if I was talking to my ex he would be pissed even if I used his excuse of being friends before we dated and we are “just friends” now. I really want nothing to do with him today though after that.