I think when we love someone, we overlook a lot. Even huge red flags. We fall in love with a fantasy in part or the idea that we can change a person. It doesn't happen that way, esp with an alcoholic.
All I can say is, if she has been drinking the entire relationship, do you know the real her without the alcohol? Sounds like you have insight already into what this is doing to your life. That is always a hopeful sign to me