So, based on what you're sharing with us, there was no precedent for his behavior. He has never shown himself to be a heavy drinker in social/public settings? He has never been rude or inappropriate when sober or when having consumed a few drinks? If he has concerns he needs to get support for, he should probably go to a therapist or an AA meeting. I agree that he really should take responsibility (regardless of whether or not he remembers), apologize profusely, and beg forgiveness from you. You would need to then decide whether this person is worth having in your life or not. Minimally, to go forward, I would recommend avoiding him when he has been drinking, no matter the amount; you could let him know this in advance: "If I see that you have been drinking, I will either ask you to leave or leave myself." or something to that effect. My sense is that if he did this to you, he will eventually do it to someone else.