Your girlfriend sounds like the way I was 6 months ago, she put up with my crap for years, I'd stop for a few weeks promise the moon and the stars and start the whole cycle of drinking again, it got worse and worse, they told her to step away from me till I got to my rock bottom which didn't take long for me to reach the way I was going on, I got to treatment then and things are good between us now, I put work into this recovery too though, point is you might have to step away too let her get to her rock bottom, she needs to want to get sober for herself first, be patient and the right road will become clear for both of ye