Heyday, you've been here 5minutes you say, and been reading a few threads?
If you read for a bit, you'll see that some of the people here saying to leave learned the hard way, have done the freedom programme, read the books, shelled out for therapy over years to recover from abusers. They know that trying to change things is pointless, as the only person who can change anything is the one that's doing the abusing/manipulation.
If you read any decent book on the anatomy/dynamics of abuse, you'd quickly appreciate that the only way for an abuser to even consider their behaviour may be unwelcome (let alone abjectly harmful and destructive and wrong) is IF they lose every scrap of support from every single quarter. Even then, it's super rare that they'll stop.
Being a single parent is way easier than living with an abuser. Seeing your children relax, grow and blossom, now that they don't have to tiptoe around their own home, and make the super fast human computer calculations required to work out what mood their dad's in.
A child in an environment such as this is described as being abused themselves directly, such is the magnitude of the poison around them.
They are being harmed every single day they are in it. The sooner the situation ends, the sooner they can start to repair the damage.
Abusers never change. Only ever get worse. No matter what you do, say, think/don't think. The OP details a difficult man, but one that's got increasingly worse, noticeably so in the last 6m. I know it seems like giving up to the inexperienced, but seriously, when you've lived it, seen it, and come out the other side, the knowledge that all the rumination, anguish and hope will only ever amount to nothing but disappointment.
The only chance of being taken seriously by a man like this is to leave him.
Meantime, the upside of that is that you're freed from the poison, and can start to see the wood for the trees.
So, as well as you mean, please don't feel tempted to advise someone to try harder and stay in a damaging relationship, especially when there are dc involved.