What is the purpose of life?

I once renounced the world for a few days... It was the best time of my life
But now that I am back in the "crazy" world, I am drawn back into the world of illusions and fantasies. I forgotten the pure pleasure I once had before. Just like drinking the seawater, the more I drank, the more thirsty I am... it becomes a additive toxic

Yesterday, a death happened. A death that has been predicted to arrive, sooner or later. I would say, it is sooner than others'. But yes, it is predicted, he finally gave up to the incurable disease. I am not here to mourn or to cry. I am trying to reflect...

During his life, what has he done?
Has he served the purpose of his life?
Has he fulfill all his dream and desires?

What is the purpose of life?
What are we here for?
Why are we running in never-ending circle finding something called happiness... and yet can never own it forever?
WHY?
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A minute ago, he is still alive... the next minute, he merely a piece of matter, left alone to be burned. No matter how much he was loved, he is no longer wanted.
For some, the world crumbled for a while. And yet, the sun still rises in the morning, the world still spinning as it always been.
And soon, he will be forgotten, as if he never exist in this world.
The world doesn't even notice our existence.
We are just as small as a fraction of dust in the universe, so insignificant.