I agree about getting copies of everything sent to both parties.
My EXH genuinely did make a threat to me as he walked out of the house. I suppose that made it 'easier' for me to get the locks changed and put a bolt on from the inside, and by god I would have called the police like a shot if he'd tried to get back in that house, with me and two young DSCs there.
He may not have meant what he said, but he said it. Vile.
And actually I did need to call the police, some years later .... and then again ...
Anyway, the one thing I regret was not realising just how fast he'd deprive me of our money. Preserve what you can from joint money and assets, for your DCs - although a bird in the hand in sometimes worth two in the bush with regard to child support.
Stay calm and don't say things you don't mean.
He'll be full of regrets one day, but you can move on.