I'd like to think he's telling her not to worry about Toph. Not that Toph is a romantic interest, but because she is just generally a cause for concern.
Toph had a very obvious crush on Sokka but never said anything (until the last episode, when Suki saved her from drowning and she thought it was Sokka). It wasn't outright stated but it didn't seem like Sokka reciprocated or was even aware of her feelings.
Anybody know where I can get the Mandarin dub of the original cartoon? Or anime, I don't know.
Netflix has this new thing, and the Korra one, but the original doesn't have the dub. I don't want to steal it, exactly, I just want the Mandarin audio.