I understand why that response was unsatisfying for you. But I actually feel like it's better, because it's realistic. Ex-MC said at one point that he'd never abandon me and never reject me (or something to that effect). He technically didn't abandon me, but he changed the boundaries of the relationship, and it certainly felt like rejection. So it hurt more that he promised that, then didn't follow through.

With current T, he'll say things like he has no plans or intentions to go anywhere. But there's always a chance something could happen (say, his dying unexpectedly or having to move to be near his wife's relative or something, though he assured me he had no current plans to do anything like that). And he's said that he would never just drop me as a client unless I did something really awful (like physically threatening him), that we would always try to work through any conflict that came up. And in a way, I actually appreciate that more, because he's not making any promises he knows he might not be able to keep. It makes me trust him more.

So I think that's probably what your T is trying to do, to avoid making a promise she doesn't know she'll be able to keep.