Ok, In FFX, it clearly says that Tidus is a dream of the Fayth and that he was never real and neither was his Zanarkand. Ok, that part makes sense.

But, why in X-2, is Yuna telling him the story of how she found him? It doesnt make sense. How can she find a dream? The Fayth disappeared, and so did he. Can anyone explain this to me?