So true and so often ignored. I always add to that, "and if you asked each of the two to describe the dynamics, you'll get at least two different answers."
It is why I religiously refuse to take sides in breakups unless there is violence or one side is a child. Angelina Jolie didn't "break up" the Pitt-Aniston marriage. Pitt chose to leave. I think the odds are that Schwarzenegger is horrible partner and was a serial philanderer during his marriage to Maria Shriver. But in both cases, I have no idea how it was to live with either Aniston or Shriver. Best to work on my own failings rather than judge the alleged failings in others.