People traffic!?

Isn't it crazy the way that people come and go in your life!? Those who stay in touch and prove to be "good" and "life-long" friends and then there are those who prove they are not! But what really seems to amaze me is when you step back and truly realize the overall picture.. Sometimes God just shows his power and all-knowing knowledge! To get a friend when you need one.. meet a gf or bf right at a superb time.. or a friend leaves after being there or fulfilling a need or purpose.. that you may or maynot be blind to! People come and go everyday.. and we don't think twice about it! People traffic... it isn't so different then driving around in vehicle in a busy and big city! People walk around with almost a bubble surrounding them... always going somewhere.. delayed at lights.. construction.. or other slow moving "vehicles." I just know that in my life people have come and gone.. but there have also been those who have stuck true.. taken the time to get the "true" me and have continued to stay in contact! It is great! Even when it tough to sometimes say goodbye.. many times is for the better! Whether yours or the other person.. Have you have a similar experience.. get a friend right before another one leaves.. or get one right when you need the encouragement or then comforting?? How can people not see God's hand in that?