Can someone analyze this sarah dessen quote for me?

It basically means that when you go into something, you should know that it's not a hundred percent it will last forever. But it's not a zero percent either. It'll be something to look back on, when you miss anything, or if you miss a friend, you can think back on that memory and know even though you're not friends anymore, you will always have memories, but you hope you still remember who they were, not who they changed to and currently are.