Why?

I don't even know how to begin..
For the past few weeks, time has basically stood still..
"Why?..How Come?"...are a few of the questions that run through my head..
I do realize that in life, there will be people who waltz in and out...some of them may leave their mark behind...some may be pretty forgettable...and all of that is ok..
But then there are some...who come into your life...walk away and then come back again...These people eventually are not just "people" anymore...they are more like family...
and then they vanish..
just like that...
2 weeks later, you realize that they have moved on....and not moved on in a small sense...gone on vacations...changed appearances(thanks to the world of facebook, you don't even need to see people in person anyways)..while you and your world are still struggling to pick up the pieces...
Why?I just don't get it..
All I was left with was a tremendous amount of grief...like a close family member died...
right now, at this very moment..i am left with anger....because i feel cheated...my world has been deceived...