Is it normal for ur ex to talk to ur ex friends?

I did end my relationship on good terms and I talk to him casually but recently I broke up with my friends cuz of some reasons and he went and talked to them and tried to get us back together when he didn't even know why I stopped being friends with them which pmo. I know I'm an ex and I shouldn't care but having pet names for my friends too? He did that even while I was in the relationship......like maybe I should js stop talking to him altogether idek