...I do not know of a single one in which the betrayed spouse didn’t have a share of responsibility for the marriage problems, for example.
Of course spouses share in marriage problems.
Who said they didn't?
But.... if your spouse makes the decision to have an affair and cheat on you, that is a decision they made, you had no say in that decision. If they exercise the power to make decisions such as these, they also have responsibility for those same actions.
