If you are planning on leaving him just because of this, it is a massive life change to make on this, yes bad mistake he has made, but really worth leaving your relationship over...?
It all depends on the rest of your relationship. How is he the rest of the time? I have read most of the thread, but admittedly not all so sorry if I have missed something.
A lot of you would tell me to Ltb...
My DP has an issue with drinks, finds it hard to stop once he starts, it has led to big binge nights out with coccaine.
He doesn't make it home probably about twice a year, it used to be a bit more. Like yours, ends up at a mates house, too far gone to be able to face coming home and crash out on the sofa, or asleep on the night bus was a fave ( uber is brilliant for avoiding this eventuality).
He knows he has a problem with binging, has been to aa, counselling, therapy, is fine most of the time, then there will be another episode.
I am furious, he is guilty, apologetic, full of self loathing etc. And then we work through it. He makes an effort and is getting better...
However, I don't Ltb, because the rest of the time he is a wonderful supportive loving partner, a brilliant dad, works hard, does his fair share around the house, is devoted to me and our family.
I didn't read the full thread because the judgmental people saying you should leave him based on this one episode alone annoyed me, yes it is shitty behaviour, not ok, but there is a lot more to a life together.
If this is another thing on a list of things wrong with your relationship then by all means take stock and get out if that is the right thing to do.
If it is just this one bad night I suggest you have a think and take the mn ltb chorus with a pinch of salt...
Obviously I am biased, having chosen to stay in a relationship where this is a recurring thing, but it works for us.
Good luck op