I get it now! (I think.) What he did is made promises he couldn't keep. He actually made promises that NO ONE could be sure they could keep. Maybe because he doesn't quite get how important a promise is.
I've had a rather high percentage of the few people I HAVE trusted die. A few years ago, I mentioned this to a friend and said that "maybe I'm a jinx" and that it might be safer for him not to get involved in a friendship with me. His exact words were, "nothing bad's going to happen to me!" I warned him that he had little control over what happened to him.... He came home from multiple deployments with PTSD and shot himself this past spring........ While I was contemplating that, I went through a phase where I was really sure that was all my fault to, because maybe I really AM a jinx.
I'm still rather conflicted about what "reality" is with regard to all this, but I'm entertaining the possibility that it actually wasn't my fault he's dead and that he made a well meaning promise he had no way to keep. I think that's maybe what your T did too. He meant well, but we can't see all ends and he probably doesn't get how big a deal that kind of promise is.
As far as asking who your old T was, here's another thought. When I get called to trim a horse's feet for the first time, I sometimes ask who their old farrier was. Several reasons for that. I DO know many of my competitors. Some I like & respect, some not so much. If I know who my predecessor was, I have an idea what to expect. We all have our strengths and weaknesses. Sometimes it gives me a heads up that the horse might be worried, because the other person is rough. Sometimes it tells me that the owner will be pleasantly surprised if I show up as promised, because the other person frequently doesn't. It's just me, gathering information. I still take things as they come and go on from there. You actually may not be the only client who's left this T over similar issues. (Again, that's "him" not "you".)