I would leave with the children, as you are doing, and place him in the hands of his Higher Power, accepting that you have no control over your husband's destiny.
He is beyond blessed to have the money to actually stay in rehab for 90, 180, 365 days, whatever he wanted, if he wants that. He is not in a gutter. He has a lot of money and if he makes a turn, if he has that moment of surrender and wants help, he has the means to get the very best help available.
The image of you crying and packing is so moving.....so many of us here have lived that and we wondered if we would ever be happy again, how could we ever be happy again.
Do the right thing for your family, and allow the rest to unfold according the God's will. This is the 3rd of the 12 Steps. "Made a decision to turn our will and our lives over to the care of God as we understood God." The first 3 steps, if you concentrate on those, will bring you the peace you seek.
1. We admitted we were powerless over alcohol, that our lives had become unmanageable.
2. Came to believe that a power greater than ourselves could restore us to sanity.
3. Made a decision to turn our will and our lives over to the care of God as we understood God.
Many blessings to you in your sorrow, and many good hopes for your recovery.