Have you ever come across the term "the end"? In the movie, or maybe in your daily life's conversations? Well I think the term "the end" is somewhat overrated. Sometimes we think that when two people say goodbye to each other, it really is the end and they will never, in the future, cross each other's path again. It is kinda sad, isn't it, to live your life knowing (or rather forcing yourself to believe) that you are never to see the friend you used to share everything with? It's silly, actually. But that's how life works, right? We are given the privilege to choose and sometimes we make the right choices, sometimes we make the wrong ones, but then again, we don't know what is right and what is wrong until we really did it, or in this case, we don't quite know whether it's really the end or merely a long pause before we realize that we've never left in the first place.
"....But know this; the ones that love us never really leave us. And you can always find them in here [puts his hand to Harry's heart] ."
Sirius Black in Harry Potter and the Prisoner of Azkaban