Aang and Katara returned, dejected, from a showdown with Master Pakku. Sokka heard them explain, but couldn't bring himself to care.

What's wrong with Yue? he despaired. What's wrong with me?

When Katara's breathing relaxed into snores, Sokka heard Aang's blankets rustle as he sat up. "Sokka," he whispered. "I'm sorry about Yue."

Sokka rolled onto his back, staring up at nothing. "So am I."

"Hey." Aang got up, coming to sit on Sokka's bed. "She doesn't know what she's missing if she doesn't want you."

"You really think that?" Sokka's heart lightened marginally.

Aang nodded firmly. "I really do."