If he is drunk, he wouldn't be feeling much except happy with the world. I can promise you, that's why we drink.
Sober, that's when all the emotions pour in like an avalanche And we can't cope.
And that is why we drink again
That's the vicious cycle.
You gotta let him go, till booze kicks his ass so hard, he can't take it anymore.
Be ready with a plan, support and advice.
That is if you decide to hang in with him.
Best of luck with it.
God bless