What advice do you give for us in this sitch. My wife left 9 months ago but checked out long before that. Do you think divorce is the only way to go?
As far as boundaries, they are rather limited once she move out of his house. I would say to make her stick to the agreed child care/visitation scheduled, agreed vacations and holidays, and when she pulls her little tricks of being half a day late getting them or cheating you out of your full vacation or special holiday with the kids......you carry her a$$ to court and make her stick by the order.
Don't allow her to intrude on your time and or guilt you into baby sitting while she goes out GAL. Things like that are about all you can do. You can mainly drop the rope and leave her alone. No communication unless absolutely about child related and nothing else. Perhaps if she sees you are really done with her (and that's what she needs to believe) then she may start pursuing you.
But boundaries work better when you have a WW living under the same roof as you.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!