If you're an adult and are either in school or have a job, you have probably realized by now that life is definitely a puzzle, and its pieces are scattered in this world and -- most likely -- the next fifteen dimensions. I'm not trying to sound like Forrest Gump (because let's face it, he sounds much cooler when he talks about life), but life really is like a puzzle! Think about it; when things are going well in your life, the puzzle pieces tend to fit together and make a pretty picture (for fun, let's say it's a picture of Tom Hardy). But when everything seems to fall apart, it's as though those puzzle pieces are breaking apart and therefore; the puzzle fails to make any sense (as though Tom Hardy's lips are where his belly button should be). Here is the interesting part: the puzzle only falls apart to make a new puzzle from its altered pieces; a puzzle that becomes more beautiful than the previous one (let's keep it clean this time with a picture of Paris).
You probably still think I'm a neurotic because this probably only makes sense to me, but what I'm really trying to say is that life is a puzzle, and the events and relationships in our lives are the puzzle pieces. Their purpose is to break apart from the puzzle, reform into new shapes and sizes, then pull themselves back into the puzzle and somehow make room for themselves. That is the cycle of one's life. Sometimes pieces from the puzzle will fall apart and break, but they do so only to come back and put together a more beautiful and elegant picture that represents your new life. It's like Darwin's theory of the "survival of the fittest"; the pieces change because you change, your dreams change, your friends change. Though at the time when everything is falling apart you may lose faith, just remember that things are only changing in order to accommodate your improved life.