That may be true. But the T allowed this dependency to happen in the first place. T fed the OP's dependency by choosing to reply to every email.

T has every right to want to end email communication, but, for T to abruptly cut off this email support without as much as giving the OP advanced warning is what is difficult to grasp. I don't think the "quitting cold turkey" approach without a discussion about it ahead of time (at the bare minimum) is conducive to building the therapeutic relationship in the least. In fact, I find it to be more damaging than anything.