The reason why he left......is because God loves him.
God wants him to know more about Him.
God wants him to know how much He cares about him.
God wants him to know that no matter how much he has screwed up, He still fixes him up in mysterious ways
God took him away, so that he could use him to teach us all a valuable lesson that, life should not be taken for granted.
That life......should not be wasted away with all the temptations, distractions, and all sorts.
That we should all cherish each other, no matter how much they can be a pain in the ass for you to handle or to even bother.
Then I guess that's how God wants to tell us, that its life.