Blake is very correct.
We addicts are NEVER recovered. There is no magic miracle cure. It is constant work to stay in recovery and stay clean. I think your husband is wise to stay where he is comfortable and secure in the knowledge that he has less chance of relapsing. Think of it this way--a diabetic is never cured of diabetes. Insulin and diet control the blodd sugars, but it is a big change in lifestyle that must be for the rest of your life to keep the blood sugars under control. It is the same with us addicts. It is a life style change.
I was a pill addict who secured her pills mostly through my job at a hospital as a nurse. I knew once I was clean I could NEVER EVER return to nursing. It was too much of a temptation.
Go to NARANON and get support. I am sorry that he wants a divorce. I wish I had some words of comfort for you on that.