It is a well known pattern in co-dependency research. A woman will be married to a drunk for 20 years, nagging him daily to quit. But, when he hits bottom (or gets the initiative somehow), and sobers up, they break up and she forms a relationship with new drunkard or drug addict who she can spend her time blaming instead of doing the inner work to find out what she is not facing in herself.
(I was a drug addict in a toxic relationship, so I do have a clue)
Wow! That is terrifying, I need to look into resolving this! I wouldn't want to keep that trend going. I need to figure out what that could be! Thank you for this!