stop it!

it's cuz one care and love, one would nag you to stop.
but why, why do people wait till that one gave up/is gone..
then regret and stop?
why don't they realize, it is then, that it is TOO LATE..?
i personally know of people whom these happened to.
mistakes were done, lessons were learnt, a life of regret followed.
i beg of you, to learn from their mistakes..
so you wouldn't have to go through what they did.