1: Bad Choices

Book 2!
Iroh left you with these words:

"Make the choice now, before you become attached. Lose the child now, or risk loving them with all of your heart and having to make the tough decision to lose them later. Because a child of the Fire Lord may not have any choice but to succeed them. And if you have not figured that out yet: it can be a very deadly position."

And you chose to keep the child and hide them away from the Fire Nation. But what you didn't expect was to lose Prince Zuko as well. But you didn't lose him to your decision. You lost him to his own bad choices.