There is a clear message in your post--your husbands disease is affecting your children. Is this fair to your children? Your courage should come from putting your children first, they should be your priorty.
What are you accomplishing by letting him come back? Nothing.
It is up to you to stop the insanity. Make plans to move forward with your life, for the innocent victims of your codependency and his addiction...your children...do it for them!