Zuko wasn't stupid, he and Katara were just waiting for the 'right' moment to tell Aang about how they were dating. But from the sounds of it... Aang already knew and this guy was coming in to play hero to the damsel in distress. No wonder Aang had taken to avoiding them for all this time.

"I don't think he needs you to speak for him." He slid over to the edge of the bed, sitting on it, still glaring over at where Damian was with the cat.