I’m so sorry you’re dealing with this, but just imagine, you’ve got another 40 years ahead of you to work, raise your children, and be happier, before even retiring. Much better to do it now.
Just on the point of not getting between the kids and their father. I understand this theoretically, but have an very serious example of how this can go pear shaped very easily.
My SIL left her alcoholic husband, and he ended up living with his girlfriend. Because she insisted the children needed to still spend time with their father, they ended up in some really appalling situations with the step siblings, and being left home alone etc at a really young age.. and even now, her son has ended up at his dad’s house and at 23 is now just like his dad.
Her daughter (who suffered the abuse in the hands of the step siblings) barely sees him.
Imagine this wasn’t their dad, but a godparent, or cousin, or even a nanny, would you feel that they are OK being around his behaviour?
Keep this on the back burner, but just worth considering if you’re giving out to yourself about “taking them away”. I’d say you were keeping them out of harms way til they’re old enough to articulate their own needs, and tell her if they’re unhappy with him.
Good luck, and keep your strength up. You mustn’t give in when it gets tough. The fact that you can already manage all the work, and the housework, and the being a responsible parent, with this witless waste of space taking up emotional and physical space, by comparison you life as a single parent will be a breeze.
Paid childcare is SO much easier to manage than a repugnant other half
Obviously just my opinion.