trouble is, all the suggestions he gives as to you making yourself happier have no input from him. He cant understand why you dont want to just do the same things that you used to do to bring you happiness.
He doesnt want to be part of your happiness plan, and yet you seem to be totally reliant upon his interest in order to achieve it.
But he isnt interested, is he.
He was interested when you were both single/independant. When you could do things together at a whim. When unhindered by children and talk of children.
But the children have changed that dynamic. You have changed as a result too. And he has stayed the same.
5 years on and he still is the same. You cannot make him WANT to find the kids interesting, even though that is tragically sad for them and you are obviously very upset by that too, because they are part of you both, so their rejection cuts deeper than even his rejection of you. But you cannot change that.
you worry about what he will do, and what women he will end up with. Dont. It doesnt matter if he has a string of young women, none of whom he marries. He has money and, by the sounds of it, international fame. It may not bother him, he already knows he is not the fathering kind.
But you are really on a hiding to nothing following the path that you are following.