Poor thing gets upset that he can't be the honarary "man in your life" while making himself comfy with the next woman he will betray. If you aren't at home to honor his memory every day, who will?
Aren't you supposed to pine away your life thinking about his greatness? What the heck is wrong with you? Why do you want to ever enjoy time away from the house? What if he wants to call and point out something you do wrong, or talk about how much fun they are having? Who will answer? Who will listen to his crap?
You go girl !!!! You living the better life is not what he wants to think about. If his life is so blessed right now, why wouldn't he want you to find your happiness? Because part of his happiness is based on controlling your happiness. In his version of reality, you are supposed to be "limited" to his comfort level.
The Ms certainly need to keep writing in their feelings journals. It might help prepare them for writing him a letter about how they want to love him ... just him for a whole day. And be loved by him alone for one day. Not because you told them to, but because it was their idea. Of course, he probably won't do it and will accuse you of being the cause of it. They will know better. They will know how they miss him. Maybe he needs to get those letters on a regular basis, or at least on special occasions. Maybe one day it will sink in, and they will have a day to remember.
The GF, her kids, and all the other relatives were not in the settlement negotiations. You know you should not be exchanging your kids with others at all hours. He should be told that in the most polite sort of exchange. One where you start by saying you have waited till the emotions passed and the kids weren't around; so you could simply state for the record that agreements are being violated and for the record ... it is not acceptable. Maybe repeat the part about "for the record".
So you let the kids journal. You keep your journal too. Vent there, along with capturing all the facts and all the names of people who may have been involved or witnessed. In your journal, what the kids come home and say is not "hear say". At least in your journal, their concerns are concrete. You may never need those notes, but a time may come when it will be appropriate for you to share all the details ... for the good of the kids.
The tub is almost full, so just relax and soak for a while.