Drink is an accelerant to so many marriage/relationship/friendship breakups. I've seen it cause so many issues between people that I wonder about the cost/benefit of booze.
A workmate and generally very decent guy killed himself after he and his girlfriend had a row. He was drunk, but not enough to stop him putting a hose from his exhaust pipe through his car window (back when 4-star was a thing).
A friend of mine took to being an alcoholic, to the point where his breakfast was Becks, lunch was whisky and supper was brandy. Needless to say, he lost his driving licence, his job and his wife in that order.
I think it just magnifies any argument, any relationship flaw to cracking point if you let it.
Taking that just a little further, Alcohol Abuse was epidemic in the Army until more recent times.
Doubtless all that Drinking destroyed the Careers and Marriages of many otherwise good men.