I'd walk away.

Unless he guarantees he will NEVER drink again.

Maybe this sounds severe, but for someone who acts like that, there is no such thing as accepting moderate social drinking. He's proven himself to be violent when he drinks.

But, I can pretty much guarantee you that he'd never agree to not drink again. People get blinded into this "moderation" crap when the truth is that while some people are happy drinkers, others are violent drinkers. Violent drinkers should give it up totally or live with the consequences.