Okay, I'm gonna get real here. He is an alcoholic who appears to have mastered hiding it. He wants to go home and get back to "normal"???? His normal is active drinking. He is sober now because he is under someone's watch. It will not last if he is not in active recovery.
He has a loooooong loooong way to go. The fact that he has severe DT's tells you that his disease is pretty bad. It is a progressive disease, it will get even worse from here with any relapse. There is no promise of success, especially when he doesn't want to pursue rehab. How do you trust him? You don't. Not now, maybe ever.
You are only 6 months in to this relationship? With the kindest of intensions, I would say RUN now. Going to Alanon is great, it will help you understand what's happened and will make sure you're healthy moving forward in your life. But if you aren't tied to him by marriage, finances, etc and you can move forward....move forward. Otherwise, you are signing up for a difficult life. (((hugs)))