So so new to this :(

[peacetoday]

I agree with the others and may add

Know your legal rights and see if there is anyway-you can legally protect the kids from too much or any contact with H right now until you can get things in agreement

I just don't feel the MLCer is truly capable of safely parenting teens or younger
and your H is showing real signs of neglect for them

They are very self focused and I don't think very rational and whatever you say will go in one ear and out the other-

But any discussions with him need to be rational and calm on your end-
he may deny it and or lie/so your words may not be even heard-
or he may comply only to do something else that is careless
You know him better than me

but I would consider legal advice to see if there is a way he can have supervised/or very limited visits
like out to dinner for 2 hours then home
or out to movie and ice cream for 4 hours and home

He is gone in his mind-and may never return
but the kids deserve a safe/protected environment to grow up healthy

Remember one stable parent can make all the difference
I would not be afraid to stand up to him and set limits/visits around the kids-