I think you should print out the original post in the other thread to give to him. It will give you a good starting place for talking about it.

For what it's worth, I never told my first therapist (FT) how I felt about him at the end. I was so shut off and closed down, I barely even remember 'the end' with him. I was just done because it was the end of the semester and that was that. I got up to walk out for the last time, and HE was like, "that's it? You're just going to walk out and that's it? You're NEVER going to hug me or anything?" I think it may have hurt his feelings that I was able to leave so easily. But, he's the one who said I was dissociative and had an attachment issue, so why it surprised him I could do that is beyond me. Double It was YEARS later that I ended up writing to FT because I felt badly that I never told him how grateful I was and how valuable the experience of being in therapy with him was. Even just last year, when my dad was dying, I felt the need to get in touch with FT again to tell him what a difference he had made in my life and how much I valued the years of having a good relationship with my dad thanks to doing therapy with FT.

So, I definitely think that you will regret not telling him how you feel.