When you admit people into your life, you don't know for how long, and what purpose they are meant to serve in the grander scheme of things. And then, one day they just leave...willingly or unwillingly, leave you to pick up the pieces of your own life. You wonder why they ever came then, why they made things a little easier, a little more rosier, little more happier by their presence, if they one day had to leave, and leave everything a lot more worse. Or maybe, it is not a lot more worse. They do help you grow when they are there, help you move ahead, a little more ahead in the journey called life. Their company makes that little bit of journey smooth. Then suddenly, when they leave, you feel forlorn and alone at that spot, recollect the days when the path didn't seem so rough, or when the journey ahead so empty, and your eyes melt, and you wonder if life is worth it at all. Who could have said it better than the bard:

To-morrow, and to-morrow, and to-morrow,
Creeps in this petty pace from day to day,
To the last syllable of recorded time;
And all our yesterdays have lighted fools
The way to dusty death. Out, out, brief candle!
Life's but a walking shadow, a poor player
That struts and frets his hour upon the stage
And then is heard no more. It is a tale
Told by an idiot, full of sound and fury
Signifying nothing.