Why did the Buddha not stay longer?

Why why why?
Was that even a question that I had pondered on?

Do we take for granted what we already have? Esp those around us, the material items that we have in our lives?
What if the day comes when handphones are no longer available? Would we treasure our current phone since we cant upgrade it every few months with newer models?

Why does it take the death of a family member to remind you to show your love and appreciation?
Such is human nature.

The Buddha was wise in leaving, before we become dependent on his presence. Before we took the Dharma for granted.