Oh DP I am so sorry to hear this news. It's absolutely terrible that your T didn't give you more notice although I know it would be very difficult no matter how much notice he gave. 3 sessions seem far too little especially considering how close you seemed to be. Also, the timing is horrendous I am so sorry you are having to deal with this.

I don't find it unusual that he didn't comfort you when he was crying as I thought that's how a T is meant to behave normally. But you say he would have before normally comforted you before? Do you mean physically? Maybe his lack of any emotion or comfort indicates that he is not too happy with leaving you and also finds it hard but overall it is that he needs to do for himself or the best thing for him to do in his own life right now. I don't know obviously I'm only speculating here and could be completely wrong on it all. It doesn't mean that he doesn't or didn't care about you as a person and didn't really enjoy your time together.
It really sucks that he won't allow contact such as email updates once you are finished. The no friendship rule I do understand as besides ethics it just seems there have been so many stories of it going wrong. I only hope I get more notice than 3 sessions. I hope you do go to the last few sessions and that you will be able to get some small bit of closure from them.