Why do Mai & zuko get over looked?

I always here people about zuko & Katara или Katara /Aang или Sokka/Suki или Toph/Sukka but not many talk about zuko and Mai. I don't understand why? I Любовь them. I think they are so cute together. She rocked her life to безопасно, сейф him. And I Любовь the look on his face in the last episode when he sees her again