Richard's actions proved to me that he would do anything in the world for me. Anything, that is, except stop drinking. He simply wasn't strong enough to quit. That didn't make him weak or a liar. It made him human.
Since the chances are great that your girlfriend will continue to drink, what do you plan to do if she doesn't stop? And how long are you willing to put your life on hold and sit by idly and hope that she'll change?
I stuck faithfully by Richard's side for 25 years. He drank himself to death two months ago. It was a long, painful, and steady decline. It was every bit as painful to watch from the sidelines as it was for him to be caught in the relentless trap of addiction.
I wouldn't think that you're weak for getting out early while you can. I'd think you were much stronger than I.