Come now FL, you and I both know that's a "handwaving excuse" if we ever saw one. How the hell do you not react to learning that you don't exist, your whole life and world is a lie, and you are the central cog in a giant plan to end your own existence by freeing the "gods" that made you, despite the revelation of such power kind of undermining the whole plot? I mean damn, Yuna dying was made into a bigger deal than Tidus' Existential Crisis, and people like Terra and Cloud went far more ape-trout over smaller scale personal revelations than Tidus, despite Tidus having the granddaddy of all personal revelations, let's face it, the writer didn't care, and the whole point of this plot twist was to reverse the tragedy of the story in the most ass backwards way. It didn't make Tidus really grow as a character, and who wouldn't he tell? I can see him wanting to keep it from Yuna cause she wears her heart on her sleeves but what is telling Wakka and Lulu, who were willing to watch their favorite "kid sister" go march to her own death going to care about a kid they met a few weeks ago? Hell Auron is easily the most connected and Tidus doesn't really tell him anything until he's made privy to his own secret. The whole plot twist is a sham, and a stupid way to squeeze some drama out of a dead horse.