So if you're not Artemis Fowl, then who are you?" The boy extended a dripping hand straight up. "My name is Orion. I am so pleased to meet you at last. I am, of course, your servant. " Holly shook the proferred hand, thinking that manners were lovely, but she really needed someone cunning and ruthless right now, and this kid didn't appear to be very cunning.
I think it's a very healthy thing to learn from what's happened in the past. But only if you look at what happened and think, 'How could I have dealt with that differently?' Then let it go.