I ended a friendship about 25 years ago. I initially ghosted, then after a few weeks I sent him an email explaining why. Basically after a couple of drinks he’d pick fights with me, and anyone else nearby, and I got sick of every night out ending with an argument. He was lovely when sober, but would argue that black was white after a couple of pints.
At the time we were all very sociable, going to the pub every weekend etc, so these arguments were a regular occurrence. These days I don’t drink, never really go to pubs, so if we were friends now I’m sure this wouldn’t be an issue.
I often think about him, and wonder what he’s doing. One day I might try and find him, but his name is quite common so I doubt I’d succeed. I don’t really regret it though, because at the time it was making me unhappy. But equally I can look back now and think how sad it must have made made him, because we were running buddies, and it left us both without someone to run with.
If I had my time again I’d handle it differently. As soon as I saw him reach the point at which he’d get argumentative, I’d ignore him and walk away.