Toph decided to spy on Sokka tonight.
Sokka didn't know that Toph knew he went out of his tent to watch the moon. He went out there every night, sometimes he talked to the moon, sometimes he pretended he wasn't crying.
Toph knew he was crying. He mumbled a quiet name she didn't know.
Sometimes she wished that she was the one he was crying about.
Other times she didn't.
Any way she looked at it, Toph didn't win.
So this night, Toph stayed quietly in the shadows. Listening.
"Yue, I'm sorry I didn't protect you," Sokka said, "I love you."
Whoever Yue was, Toph was jealous of her.