He's been quitting for 2 years. That's the most ridiculous excuse of a detox program I've ever heard of. That's not recovery. That's denial.
At this rate, it'll take him about 6-10 more years to quit drinking (that's IF he wants to quit drinking.) So what have you been doing for your own recovery during the last 2 years and what are you going to do for the next 6-10 years? How's your detachment? Have you built up a nest egg that he can't touch in case something happens healthwise or accident wise? Are you attending alanon meetings? Getting face to face support?
What are you doing for YOU?
Are you happy? Or is your life consumed with his drinking? I hope not... He is finding his fulfilment in alcohol. I hope you are finding some too.