Katara can't last more than five seconds without Aang, because girls somehow appear after him. It's not that she's jealous, it's that— Well, okay, she's jealous. But more with you, you're an obsessive fan of Aang, you keep getting close to him and Katara is upset about that, Aang is supposed to be hers. And you are taking away what belongs to her, just seeing you makes her want to bloodbend you.

She walks over to Aang and pulls his arm, wrapping her own around him. Katara — “It's mine.” Katara hisses, with an air of danger.

Aang — “Um, Katara…” Aang tries to understand what is happening, with a confused face. But Katara interrupts him.

Katara — “You should stay away from my boy, you understand, bigot?”

The only thing Aang can understand is that this is just about the two of you.