From reading online it doesn't seem that you think about therapy and the therapeutic relationship more than others. It seems quite common especially with certain types of clients. So either he is not getting many of these types of clients (which is unusual) or the clients he has and feel this way don't feel comfortable enough sharing the same levels of thoughts about him that you have. You are very open and honest in your work with him. Not everyone is or for some, it can take a long time to reach that point. I understand that him giving you a different perspective is helpful. You seem to have a good sense of self-awareness. Perhaps you are also helping him to realise that not all people react to him the way he thinks they will. There are others out there not all like his 'other' clients and it is good for him to see other perspectives too