I have been through this quite a few times. I had to ask myself the question: what is my motivation? You know what you know, more will be revealed both to him and to you. Focus on your own recovery and practice loving detachment. If he is working a program with a sponsor, maybe there's a chance he'll come clean in the AA environment and buckle down to work hard again, then again maybe not. These are the risks we take living with an addict/alcoholic because the risk of relapse is huge.