My partner is so low & we are falling apart.
Best advice I can give is get in contact with Alanon. It's for family and friends of alcohlics.
30 , 60 , 90 days then 6 month, 12 month, 2years is commonly the hardest for anyone in A.A. If he has a sponsor he needs to contact them. If not see if you can get him to a meeting. A open meeting anyone can attend so you can go with him.
Depression is sadly common with alcoholics and sadly a few A.A do not believe in taking medication but it says in The Big Book story Alcohlic Addict written by the joint founder Dr Bob that we can.
Oops going into program mode....sorry 17 years sober tends to have me preprogrammed.