Ladybird...I am going to give you a 1/2 answer...….
I have not ever revisited any relationship with a person after it was over....but, I have been friends...more like "friendly", with some exes...…
None of these were alcoholics, though....
I know what you are getting at...so, this may not be of much help to you....
But, after many years of observation...and, what I have read and heard....most relationships that did not work out the first time....don't have a high rate of success, the second time.
I suppose there must be exceptions, though. But, I speculate that BOTH parties must have made significant changes in the important areas of the original conflicts...…..