Some people are like chapters in our lives.

If it's true that all the world’s a stage and all the men and women merely players, then the question becomes, "Who is the Casting Director?" Do we do it ourselves, through some mysterious process that's unknowable to us, on this plane at least (At least to most people)? If that is the case, the next question is, "Why do we make the choices we make?" And then, "How do other people's wishes affect ours?" Or is there some sort of higher power doing it? And behind Door #3 is, "Is it all a product of random meaningless coincidence?"

When I was much younger, I pondered this idea quite a lot. I wrote a poem about it at one point titled, "A Friend Just for Today."

Yes, there are a few people that I have thought that.

Yes, sometimes we feel like characters in a book or something. But that's just life..and you wonder why certain things happened in that sequence.

That's a very philosophical question. Some friends I remember with happiness, one or two I wish I'd never met!

that's true but what ever happened in this life i'm really greatfull that i meet them either they gave me some pain it's fine because of that i can learn my lesson right? haha

Yes, some people come and go in our life, but true friends will always stay and are part of our life.