Well, it's really over between my girlfriend and I. We've been here a couple of times before, but this time it's the real deal. There are multiple things that brought us to this point beyond just my relapses, and rationally I know this is for the best.
But emotions have a funny way of disagreeing with logic. I'm angry, resentful, and sad. But the small sliver of silver lining is now I'm free to eventually pursue a healthy relationship that doesn't carry the baggage and uncertainties of this one. One where I no longer have to feel guilt and shame regarding my drinking, because it's part of my past and I've learned from it.
For now - recovery, and cultivating new friendships.