Work on developing detachment. And this means detaching from the eventual outcome of your M. You have no control over this. All you can do is focus on yourself and the kids and make improvements in yourself. You W is going to do what she is going to do.
That isn't comforting, I know, but it's the truth.
Now, this does not mean you give up on working on your M. You walk two paths - getting yourself to a point of accepting the worst case scenario with the realization you will be ok AND making positive changes in yourself while working on your M (if and when she's ready to work on the M).