growing apart

people grow and sometime in a way you don't want them to be
they may exceed your expectation
and start running way ahead of you..
leaving you in dust, thinking, why does things end?

or you are the one running ahead
reaching your goals while they stop and lurk
and you might not realize it until one day
you turn around, thinking, why do they drag me down?

why people grow apart?
how people grow together in the first place?