Discussion: I wanted to ask whether the divorce has a logical-mathematical expression.

I must admit that you took the model I proposed a few steps forward. I propose to examine the outcome of divorce in a logical form of negative synergy, i.e., the whole is less than the sum of its parts. Or, to put it simply, both partners are happier (overall) apart than together. The expression of negative synergy also has a mathematical expression; I will try to put it simply.

A and B reflect happiness (energy) separately. | a, b reflects happiness (energy) together.

{A, B} > a+b

My answer is relatively superficial because "happiness" is a changing state. Your attempt to take emotions to the behavioral plane is correct. I believe that there were later mathematical models of human behavior as well. (Without them, it is impossible to perform full simulations that mimic humans)

Link: The Unified, Bipolar, Energetic Model of Primary Emotions.
https://www.sf-healing.com/page/235 (Copy & Paste)