I’ll weigh in here. Obviously, I do not know the whole story and I could be very wrong but here’s my take on the situation: It seems to me like he was very hurt by your angry email message in which you attacked his ability as a therapist. That’s understandable as he is only human and, especially, if deep down he felt parts of your email message were actually true about him. However, instead of working on or managing his anger with himself regarding your email, he took it out on you by letting you know you are an isolated case of a client who emails. He most likely knew in advance that this information (you being the only one who emails) would hurt you...no one wants to feel like an isolated case of anything in an already tough world. It seems like he was trying to get back at you. This could maybe also explain how it was easy for him to be “incredibly nice” to you and especially if he maintained a caring and gentle tone of voice and a high level of attentiveness throughout the session. In short, you both hurt each other. How you both move forward will make all the difference...the words will matter greatly. I wish you all the best.