Again I'll relay my own experience. I had MANY boyfriends that expressed concern about my drinking. I got defensive and angry. The relationship usually ended. When my current boyfriend threatened to leave, it was the straw the broke the camel's back and I finally went to AA. And I'm SO HAPPY I did. Our relationship is 100000x better, I'm so much happier. Your girlfriend and you can have this happiness too. But only if she is willing to get help. AA is not the only way, there is also SMART recovery, addiction counselors, etc. Like I said, many of my previous relationships ended in part to alcohol. So she may or may not get help. Be willing to accept that and end the relationship. Sorry for the tough love. Just trying to save you a lot of pain and heartbreak ahead of time.