I feel so bad knowing that awful dilemma you are in. I think Bugsy`s advice is really right on.
I am in the exact same place as you and its so hard to take that final step off the cliff.
We hold out hope every time our spouses show signs of M life and then get crushed again and again. I really think Bugsy is right a out the green flag right in front of us. I don't think there is any other way than to bravely move forward as single parents and our spouses may or may not catch.
Its hard to remember your real value when you are living with so much confusion on all fronts.
Your a beautiful, strong, peaceful woman and Mom. One guy with problems can't take that away from you.