You need to change the email addresses for your children and block him from the old ones. You need to go NC, immediately. IF you communicate anything to him, just say that it's become obvious that his continued presence in your lives is unhealthy, and you need time and space to process the abuse he has perpetrated against you all. Until he's prepared to take responsibility for his crimes against you all, that there won't be any contact whatsoever. That he has lost that right when he tried to kill you in front of your children.
Your DC can't heal until they have space to do so. He has not learned a single thing and is deep in minimisation of the horrors he inflicted on you all, denial of every evil deed he perpetrated against you and placing blame for it all on your shoulders.
What this situation does is keep you in a state of Fear, Obligation and Guilt (FOG) this 'Fog' does what it says on the tin, you can't see the woods for the trees, or even the hand in front of your face.
Lundy Bancroft says for an abuser to change, for him to decide to NOT abuse he has to pretty much lose everything in his life, his friends, family, work, everything. Even then the chances are he won't want to be a 'nice' person, or be kind to women. this is because he ISN'T a 'nice' person and he hates women (and himself)
In my experience, abusers never change. never ever ever. Oh sure there are posters (1 that I can recall actually) on MN that swear that theirs has changed. I seriously doubt that they have, merely that the former victim is managing life so they don't kick off. I am willing to bet that the FEAR of them abusing them is ever present albeit subconsciously. they are not free/happy/normal, they are merely coping and denying the rest.
There are stages of recovery turbonerd to start the recovery you need to see what's happening. I think your eyes have been opened here, and your journey has begun. You can't go back now, only forward. Your destination is freedom for all of you, and you will get there.
You made some bad choices.... Learn from them, move on, and protect your children
I know what you are trying to say bbery however this sounds dangerously like a blame comment there. it may not have been intended, am fully aware of this, but to a victim of DV used to being the one who got it wrong, interrogated and harassed until she was forced to admit it, that's what she'll see in your comment, further proof that SHE is wrong and being unreasonable.
The victim of abuse is worn down over time and kept permanently in a state of stress/confusion/fear so that all rational thinking is poisoned and bad choices are made - but put these 'choices' into context and you will see that the OTHER choices available to them were terrifying and impossible to consider.
When you know better and can see clearly, you make better decisions.