He wasn't the man of her dreams.

When the fortune teller told her she would love a strong bender, she imagined a man a head taller than her, not four inches shorter (maybe more like three or two, he had grown)

She thought of someone with long flowing hair, not bald. (Definitely not bald)

Muscles tensing this dream would leap into action saving the day. (his muscles didn't tense, and he sometimes faltered, but he was a hero)

With strong warm arms he would bundle her up and whisk her off her feet. (they road a flying bison, with her brother and a lemur and another girl)

For all that he was and wasn't, when he blushed and held her hand, leading her away from danger and darkness, she blushed and held on tight. (because in reality, dreams don't come true and Katara thought maybe she could live with that)