Well, you're going to have to come to some resolution eventually. You can get off the roller coaster any time you wish, without her permission or approval. She's still drinking and now she has someone else she's interested in. The texts are what we call "quacking." It's just babbling that makes little sense when viewed in the context of the relationship.
What are you holding on to, exactly? There are lots of women who aren't alcoholics looking for a nice guy.
You shouldn't have to accept unacceptable behavior, and her drinking is certainly that, right?
When I broke up with my ex, I couldn't have cared less if he thought I was wrong. It just doesn't matter.