Moving away with the fairy-tale expectation that it will make everything just perfect is called "doing a geographical" in recovery circles.
The problem is - no matter where an alcoholic or addict goes, they take themselves along! A pile of poo is still a pile of poo whether it is on the coast, in the Midwest, in a desert, in a busy metropolitan area, or a small island town.
Moving doesn't change anything. And you moving to where he is will be the same old, same old but with new scenery.