Should Aang have abandoned his monkhood to marry or have a family?Sources :- Ascetic Lifestyle,  Norton.com/setupIt was devastating for Aang to come to terms with the fact that all of the Airbenders and Nomads were gone after he came out of his century-long freeze.
Since the Monks and Air Nuns were not supposed to have a family as they lived an ascetic life, he was on a spot.Aang was just twelve years old when he fell in love with Katara even though he knew that he was going against the culture and traditions of monasticism.
But that can be overlooked because at that time he had no Nomads to show him the right way.
Therefore, Aang was not wrong in deciding to learn the four elements, and taking on Fire Lord Ozai.
He did all of this for the greater good while at the same time he remained a pacifist as well by not taking Ozai’s life after defeating him, which many believed to be unavoidable.As far as his marriage to Katara is concerned, that too turned out to be the right thing to do in the long run.
While Bumi was a non-bender but his siblings Kya and Tenzin were Waterbender and Airbender respectively, which meant that Avatar was not the Last Airbender after all.But when he was the only Airbender he was free to decide the fate of the Air Nomad tradition as he wished.