I wonder why?

I did not like you but I will miss you
I did not love you but I am sad you have gone
You were not good to me but you were good for me
You were not kind to me but you were key to me

You learned more than you taught
You were praised more than you praised
You spoke more than you listened
But you gave more than you took

You were not famous but you were noticed
You were not eloquent but you were accurate
You were not with us but you were for us
You were not flashy but you were very very bright

So why finish with a bang not a whimper?
So why fall when you could have walked on?
So why leave tears behind, not shed them before?
So why now? Why now?