How does one actually build a parental cooperation with xWW when I find her essential attitude unacceptable?
This appears to be a "you" problem vs. a "her" problem. You cannot control her or her attitude, but you can control your reaction to it.
She says we should be on the same page when coparenting, but I find that really hard to reconcile with her "quest for happiness" and how it affects our kids:
She's right about the first part--you should be on the same page with regards to co-parenting. What she does and with whom is now no longer your issue. Her "I come first" attitude will be transparent to your children and they will see through it. Keep putting your children first on your side.
I have to give away our common apartment for a fraction of the cost because she doesn't have the money and because "You can't throw out the mother of your kids".
Is this now your settlement, or is it what she WANTS as a settlement. My father (a fine attorney) used to say "People in hell want ice water, too. If this is a want, you have every right to advocate for yourself and a fair settlement. You do not have to cater to her whims. Her choice to cheat, her consequences to bear. Please, please, please advocate for yourself and your kids. Don't fall for this manipulation.
Her parents have to sell their summerhouse to help their daughter if the manipulation above doesn't work out (I don't care if they do but still Wow!).
Not your monkeys, not your circus. Carry on advocating for you and your kids.
Kids must lose friends and adjust to her new boyfriends because "kids are happy if a parent is happy"
Again, kids will see through selfishness. Play the long game by being as good and as consistent a parent as you can be and keeping your personal life, well, personal.
A couple of months I drew the line on coparenting with "I don't tell you what to do, you don't tell me what to do" and trying to preserve the same rules we had before we separated. That is not ideal, but I couldn't think of any better atm.
If you can, I would advise keeping the same rules at each home and cooperating on things like any punishment or such. But other than that, you are right. Her behavior, except for parenting that directly affects you or the children, is not your problem.
On the bright side, there has been no badmouthing or alienation. The shared custody schedule works fine, especially after I drew the line.
Excellent. See, boundaries are good things. Draw a boundary around no manipulation.
Cat