My AXH went through rehab. Sober for 100 days plus and went back to drinking and now tells me he never thought he was an alcoholic, he just went to rehab (to the tune of what, $25K?) because he thought I'd come back. (Which just tells me that if I had come back, he would have said "mission accomplished" and gone back to drinking, but I digress...)
He's on antipsychotic medicine. He goes to weekly individual therapy and group therapy. He will just not do anything that requires him to stop drinking...
I'm telling this story because... that's how strong addiction is. A person can have spent months in rehab and AA meetings and relapse and know all that stuff and still choose to pretend it doesn't exist, because it interferes with the only thing that's important in the world: DRINKING.
Move on. He will sink or swim. You can't help him, but you can help yourself by letting go.