His behavior is certainly immature from what you described, but it’s also very abusive and dangerous. These fights are traumatizing for your children who are helpless victims.

His habit of threatening to call the police on you and saying you are assaulting him would be enough to have me figure out how to end this abusive relationship and do what is best for my kids, if this were me. I’d also be very worried about him having even partial custody of the kids without me being there to protect them, too. So, I do understand the incredibly stressful situation you are in.

There is also the point of protective services being called in over the abuse happening in front of the kids.

You know him best. Is he as dangerous as he sounds?