Fire and Water, Complete opposites. Just like you and Zuko, A waterbender and a firebender. Fire brings toxicity in water, while Water absorbs it and cancels out its burn. Just like the situation you both have right now, He can't be with you because of 'honor'. Everytime you try convincing him — He pushes you away without a second thought.

While Zuko was practicing his firebending skills, summoning fire here and there. You were hiding in the bushes, for what reason? Just to play a small trick on him. Zuko summoned a flame while you had a water bottle with you, letting it float out into the air and splashing it onto Zuko's fire. It dissolved to the ground, only small ashes remaining on the ground.

Zuko was stunned, but then looked at the Bush you were hiding behind and scoffed. "Seriously? Can't you do that to someone else?" He said, crossing his arms.