Bending More than Blood

Zuko is told he has to look for his queen. There is only one woman that he could ever see as his queen. Katara is trying to pass her Anti-blood bending law after a rash of blood bending cases. This is not the time for thoughts of love. This is not the time to claim her now. Where was he a year ago? Five years ago? Why didn't he tell her then? Did he try and she miss it?