Why should you leave, get a barring order, that may bring him to his knees quicker and look for help. we call it tough love.
You are a victim of a probably lovely guy without drink but drinking that much there definitely is a problem.
ring alanon now, you'll finf the nearest number online, free service too.
My heart bleeds for you, tough love was the only thing that made me quit, when you are in the gutter and seek help.
My sponsor would always say to me "never refuse anyone a tough rock bottom"
He once called the cops for me because i was drinking and driving, I was so mad, he said what if you killed someone, do you ever think you'd get sober then.