My point overall is that it rarely is just one person's fault. CORRECT, PUNISHER!
I am a licensed mental health therapist, and have done LOADS of marital counseling, as well as having lived through a divorce myself.
There MUST be a history of continual and positive communication for relationships to work.
When couples would come for therapy and I would ask, "How much of your problem is the fault of each of you? Please answer by percentages."
When I got an answer of 50-50, 75-20, or 80-20, I knew there would be room for positive movement during counseling.
When I got an answer - from either person - of 100 - 0; I knew therapy would be fairly hopeless, because one person is saying that they are taking NO ownership in the issue.
You cannot fix what you refuse to own . . .