Have you ever been wronged in a relationship, job, etc. in a very unfair way that made you feel powerless? Did the system fail you?
What happened to you? Did you seek revenge?
I'm not really interested in a philosophical debate, more real life stories.
Fairness is a wishful concept, a myth that we want to believe in. Companies are not fair, they have to be profitable and feed the megalomania of the CEO. People change, and so do relationships. Shit happens.
Let it go, and move on to Plan B. You control your future, the past cannot be changed.