I have been considering this thread a lot before replying. I felt like you might think I was exaggerating when I say that telling my first therapist about my frustration and disappointment with him and with therapy was a life altering experience. But that was true for me.

I did not express my disappointment or anger well. I basically told him that he had ruined my life and I hated therapy. I refrained from saying that I hated him, but I kinda did hate him. I certainly had NO fond feeling for him at all. So I was raging at him, but in a quiet, really contained way. He responded to my anger with kindness and a gentle humor that diffused my disappointment and anger and allowed me to see that I was being a bit unreasonable. Then he asked me what he could do differently to help me AND he actually followed through with doing what I needed. Never, and I do mean NEVER in my life had someone met my anger and disappointment with them in that way. Anger or disappointment had ALWAYS been met by rage, even when I was completely justified in my anger or disappointment.

To have my therapist accept my anger and disappointment, even when it was at least somewhat unreasonable, and still be kind, and gentle AND want to help me was truly life altering. Life didn't have to be the way it had always been. Relationships COULD be different. Not everyone on the planet was going to get mad at me just because I was disappointed in them.

With my current therapist also, my telling him about things he has done that hurt or disappointed me has been really healing. He owns his part of the problem, even while sometimes gently pointing out that I may have misconstrued some things.

I hope you are able to have the discussion with your therapist and it goes well.