Okay so you built something. Irrelevant.
Evidence is something that tends to either prove or disprove, and lends credibility to an argument. The fact is that conversation is viable evidence, and that if you call yourself open-minded, you should objectively take it in, however you yourself said:
I am willing to look past his "mistakes."
You are really the biased one here.
Plenty of people are saying that encounters with Jack are negative ones. The only credibility you have is that you and Jack say that he changed. Well, if Glass and I decided that I am now a dinosaur, it has the same amount of credibility. Upon arguing "That's loving stupid" or "That's impossible", in your argumentative trends and habits, saying "Well he said he is a dinosaur, so it must be true" must be solid proof that should be understood without compromise.