Honestly the best thing to do with a narcissistic addict like this is let them walk away. If you have no property etc connecting you to this toxic person let them think they won and let them move on. They will just hang onto their drama and hand their crap to someone else. They are losers that need to believe they are winners. It’s their faulty character and is nothing you can do anything to change.

A lot of alcoholics self medicate to dull their deep insecurities. And they can’t stand feeling like they lose anything and forget pointing out their poor behaviors. They desperately need their fantasies and are very prone to behaving exactly how you described. And are prone to rage ranting. It’s a total waste of time to continue having a relationship with them.