[Yamato shakes his head.] You didn't do anything wrong, Takeru. It was all my own fault. I wanted things to be different to how they were, but I was just being selfish... You could say I needed to grow up a little, too.

[He doesn't want to patronise Takeru with the whole 'you'll understand when you're older' talk, but he's really not sure Takeru will get it, even if he does explain. So for now, he leaves it at that.]

Why bring this up all of a sudden, anyway?