Well, it sounds like there was a pretty detailed plan for how termination would happen, and that this would be a process rather than an event, and everyone would know when it was beginning. So I don't think he could have believed they had already been in termination. If they weren't both consciously doing the plan, then they weren't terminating.

I also think that if OP had not become attached to this T and had not loved him, this would not be the gigantic trauma that it actually is. I mean, if you haven't attached, you don't care, right?

Perhaps what you were getting at is more like internalization; perhaps OP had not internalized the T's care and compassion that he had previously shown over the 6 years. But I would think that even if a client had internalized these positive aspects of the relationship, being suddenly and horribly surprised by termination out of nowhere would more or less erase those internalized positive feelings.

ETA: Not trying to "yell" at you unaluna, sorry... I just think that when it comes to T's, a sudden loss of trust, a betrayal or abandonment, can destroy most of the positive feelings from the earlier relationship. Even if OP really did trust him.