longing for the lost?

are we really all that different than how we were? just three short years ago, they were the closets people i had in my life, aside from my family when i was in the mood to tolerate them. but how can it be that people drift apart? life really isn't that stressful or complicated or distracting that we lose touch with the people that at one point meant the world to us, is it? perhaps its just myself who feels that those people have different priorities than i do. maybe they actually know where they're going in life, and im just not part of it. i blame facebook to be quite honest. if it wasn't for that stalkers-in-training website, i probably wouldn't be writing this right now.  people move away, grow up, mature, i get that. its all over my computer screen. its almost like a disease, in which i uncontrollably scroll for countless hours reading two lines "status updates" about those people's lives. i can't completely blame fb; i mean i am the one who "friended" them. but  it's only because that's what they originally were, my friends. so how/when/where did we go from being best friends to strangers almost? i need to solve this great mystery if for nothing else, my own sanity. is it because they have their own lives, lives that are legitimately their own, that they created for themselves. or because things change and life is never what we think it is. or perhaps, its that saying: "out of sight, out of mind," which seems to define my life, that is the cause for all this puzzlement in my brain.  if i only knew the answer. but what is it? what can it be? why do i care? why all of the sudden am i so worried about what these people are doing with their lives? clearly i'm no longer in theirs for a reason, right?