So right, KP!
I think that when we realize that it doesn't matter if he comes back and really wants to get sober and have a life with you, we are really becoming free. I have gotten stuck by the thought that "he does want to be clean and sober, he does want to put the doc down for good" and I have given too much credit for just that. It's the follow-through that really matters, and since the pattern has been established, you are smart to see that it might not "stick". And if you don't wanna hang around to find out, you are indeed getting off that awful roller coaster. I think this is why it is so wise to let them get sober and figure this stuff out without us. We can always decide later, way down the road, if we want to give things another try.
Good for you to not get sucked back in!