[ Despite the hypothetical phrasing of Katara's statement, Zuko's face and ears color redder. ]

Uh... [ If anyone came up to him like that, let alone Katara, Zuko would feel absolutely flustered. And Katara actually knows him, so that's an extra weird thought to have. ]

Ask them why? Depends on who it is. If it were Mai I'd say no, because I don't think that would be a good idea.

[ Starting that kind of relationship with Mai up again is not something Zuko wants to get into right now. ]