No he knows he's done things wrong he just doesn't think it's as bad as everybody makes it out to be.
Well then he's a fucking idiot as well as a prick.
Didn't scare his bosses did he? Or his mates?
Just a clearly vulnerable woman and her children in their own home. He's a pathetic coward who will hurt you again if he comes back. In fact, it's likely to escalate violence wise as he would then know you'll put him above even your kids.
He CHOSE you. He didn't choose you because he loved you. Users like him don't do that. He chose you because you're vulnerable and because he knew he could control, confuse and coerce you.
And you're still letting him do it despite the fact your children are now living in fear he might come back.
You've again ignored the part of my post with practical advice about you and your children, instead defending this absolute arsehole.
So here it is again:
Prove him wrong. Tell him it's over. Block him. File for divorce. Tell his family you won't be able to speak to them for the foreseeable (because they'll want you to have him back so he's not their problem). Apologise to your kids. Reassure them he will never be back.
And follow through.
If you can't do everything on that list I genuinely think it's best your kids stay with their dad full time until you get your situation sorted. Because you sound so, so, so likely to give in to him.
Tell him it's over, you're filing for divorce and you won't be speaking again unless it's through solicitors, you'll consider further direct contact harassment and will report it to the police accordingly then block the fucker. And follow through. If he can't talk to you then he can't persuade you or confuse you.
It doesn't sound like you want it to be over and that makes me frightened for your poor kids. All the shit already going on in the news at the moment making the world a scary place, covid fucking their lives up for two years, this man 'making their life hell' (your words) for four years and now they can't even trust their mum not to get back together with him.
Wise up, choose them. Stop obsessing over the man who could make your children cut you off when they are older.