With you or with his family or with someone who drinks every single day religiously or with someone who doesn't touch the stuff-- if he wants to drink he will. Plain and simple.
A lot of addicts and alcoholics are encouraged not to get or be involved with anyone for the first year because they are so focused on recovery.
You dodged a buller here, it's not likely to be a run road and releases are common in the first year, no one can make him be committed to sobriety but himself. You addiction will always find way and reasons to drink , you just have to be strong enough not to.
I am glad you're going to al anon. You need your own support, I know it might not feel like it now but I promise you this is the best thing for both of you and certainly the best thing that could have happened to you. You would just be waking on egg shells waiting for it all to come crashing down if he stayed living with you
You said you're okay with the decisons. That's all that matters. You're not his savior. It's not your job or even within your ability or anyone else's to fix him. Focus on you and what you want and don't let him guilt trip you into taking him back when he doesn't deseve it or being involved in a relationship you don't truly want