If you honestly believe that you will be able to move forward with your life without any further hopes for......actually, what is it that you are hanging on hoping for, before you feel you have "tried everything"?
Are you hoping that if your husband finds sobriety that you will reconcile? Has he given you any indication that he wants to reconcile with you? I only ask because based on what you posted, he only contacts you if he is missing mail and that's it during a 2 year period?
Life is short Crazy, so to be waiting for something that is not within your control to make happen is well, crazy. I have known of couples who separate and don't divorce, but they have gotten on with their lives. Neither wants to remarry nor do they want to be with their estranged spouse ever again either. In fact they have split up because they couldn't live with whatever circumstances were. Nothing was going to change, so they went their separate ways forever and always.