The fact you had to ask him to be sober was the first indication that he is an alcoholic. That he became so inebriated that he lost control of his bladder function was the second. Doing so after promising not to was the third. Time to sit him down and try to make him acknowledge his problem and start fixing it. If he won't, then it's time to end the relationship, because he's made it apparent he considers getting drunk more important than you, and unless he gets help, that is never going to change for the better. It will just get worse, and so will his behavior.

Request denied. If he’s not willing to do that for you, maybe you need to stage a funeral for this relationship.