boundaries with a co parent

I recently found out my child’s father is seeing the woman he cheated on me with while I was 6 months pregnant.. I being stupid stuck around. Now we’ve been broken up maybe a month and he’s back dealing with her. I’m not sure if I should write him saying this “ going back to the same person you cheated on me w while I was carrying your child is insane. I don’t want to be friends, be cool, none of that. We can speak strictly about our child… nothing more. & y’all can both rot in hell 😘”

Because he still tries to talk to me as we are friends and even tells me he loves me everyday after speaking to our child. I don’t know if I should just keep quiet and be strict on boundaries

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