Some things are fair, some things are not. When it comes down to reality, divorce is not. The bad thing about DB is we tend to think in terms of keeping our marriage together and do things that are not good for us or our kids going forward. Because we don't want to PO our STBX.
But when we come to the end, we realize (possibly late) that we also want to give our kids a good life. Before the D, it's never too late.
And that means two separate households.
So you must do what is best for your kids. It's what you have to do regardless of who gets PO'd. That is life after D.