@Cuppacakey, kudos for telling this practiced cheat to leave. Stick to your guns and refuse to tolerate his appallingly predatory behavior or his mockery of you and your children.
He cheated when you had a newborn and he’s cheating now by pursuing this teenager. They have illicit secrets and sound mutually boosted, so there’s no telling how far it’s gone and will go. He is a pathetic creep who has a severely deficient moral compass.
His despicable treatment of you is beyond the pale. You say he’s been ‘very critical and negative’ toward you for a while. This is part of the Cheater’s Script. He’s up to no good and is creating distance between you to self-justify his transgressions.
His shitty responses today to your valid concerns are indeed classic DARVO tactics, designed to humiliate you, lock you out, shut you up, and put you back in your lane. And threatening that you’re pushing him toward the 18 year old by asserting your reasonable boundaries?? No, he and only he is responsible for his destructive, unethical choices. What a blatant, self-serving manipulator he is.
@Cuppacakey, whatever you do, do not back down. Get angry and stand strong. He needs to experience very sharp consequences while you consider your options. Personally, I wouldn’t be staying with such a morally bankrupt loser.