<human>: Condense the text into a few key points

In a serious relationship for over 3 years, marriage has been discussed and we talk about the future all the time. It wasn't until a year in that I noticed how much he drinks. It was > 5 beers a night. If he would go out without me, inevitably it would be to go on a  bender and who knows when he would get home or if I would hear back.  I talked with him several times, in a variety of ways, and he cut back drinking significantly. However the binges still occur and the fighting gets vicious. He blacks out but I remember all of it. I was very supportive of this problem etc, until he finished the last of his schooling and went out of control and really started blaming me for it. He is incapable of going out with friends and controlling himself, and will drive drunk. I've pulled keys out of his hands before. 

I guess what I'm asking is when do you know it's time to leave? I'm having a hard time with it, because I see how life could be. Then he doesn't answer the phone disappears and blames me for making him miserable while slurring on the phone. I can answer questions if it isn't clear. I just really could use some feedback. He knows drinking is issue.
<bot>: Only man I have wanted to marry can't control his drinking and turns into mr Hyde. Am confused in love woman that wants to know when is enough enough.