@Nogoodusername it doesnt make you unsympathetic at all. I am doing the same thing, it just means we are putting our own sanity first. The addict puts the addiction first, and we can put ourselves first.
I am also ignoring the letters, mine come through the post. I've blocked the numbers he calls from. I have had letters recently, and today a phone call from someone he knows. Saying they need to call an ambulance for him.
I imagine he has run out of alcohol and is now in life threatening withdrawal/is vomiting blood/has hepatic encephalopathy.
I can't do anything about this, and I supported him through it in November. Its not my responsibility, and if I was answering letters/calls etc then I would feel morally responsible to act. If the letters have anything concerning I call the GP.
I do feel very sad for him, its an awful state to be in. Unfortunately the cycle will continue, until it doesnt anymore.
He also had antabuse, a few times. The most recent time was last year. He drank anyway, and was very ill when he accidentally took it instead of thiamine. It didnt stop him drinking, and then he chose to stop taking it.