Answer: Momo and Aang are kindred spirits. In the first act, Aang says to Momo that they were the last survivors of the Air Temple. It is Momo and Appa (along with his love for Kitara) that keeps Aang "grounded". Bumi knows this and states that as long as they have each other, they'll be okay.
Hope this helps........ Stay safe and have a Merry Christmas!!!!!!!!! :D
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