IMO, you are right to feel a bit unsure about the way he handled it..
Revealing you "stuff" about your ex-T doesn't sound to me like the most helpful and beneficial way to elaborate further on what you trusted your new T with. Could you explain a little further what you mean by "he gave me a few examples of things he has heard about him or experienced himself"? What was his tone when he described these things? Where there undertones of disapproval towards your ex-T?