"People come, people go – they’ll drift in and out of your life, almost like characters in a favorite book. When you finally close the cover, the characters have told their story and you start up again with another book, complete with new characters and adventures. Then you find yourself focusing on the new ones, not the ones from the past."

People always leave but it opens the door for others and gives them an opportunity to know you and be a part of your life. Though I wonder, why do people have to leave?
I suppose new adventures means new people to experience it with but why can't the old people stay and experience it with you?  do they leave so you can forget about the past? what if i dont want to forget about my past? i thought your past shaped you for the person you are now...?