I think your story is a good example of how something that hurts at first could help, Echoes. It sounds like you felt guilty at first and then by staying with it you were able to realize you had honorable motivations.

I wonder how it is different if, instead of trying to show you something isn't your fault, the t is trying to show you that something is your fault, such as if the t thinks you are being unfair to your partner. To answer my own question somewhat, I think it can help if the client decides the t is right and the client realizes they can be happier by treating their partner differently. But, if the t makes a negative judgement like that about the client and the t is wrong, then what? Somehow they aren't supposed to be judgmental but the non-judgmentalness seems pretty meaningless if they have decided that they think their client is [what anyone in real life would call] wrong.