canada1,
What purpose will staying serve? You have made your decision and it sounds like you have both made peace with it. It sounds like you are finished. Maybe not finished with him forever but finished with the dance of addiction. He is your daughters father. He is going to be in your life probably for the rest of it. I think you can safely continue your plan and see what happens. No decision is carved in stone. Turn him over and see what life brings.
Have you attended Al Anon? You can turn him over without physically leaving.
((hugs))
JT