Was reading 8 Days when I came across an interview with Zooey Deschanel, star of (500) Days of Summer. In the interview, she said this:

Everyone has the heartbreak that shapes them in a way that they could never go back to the innocence that they had before. It's beautiful and poignant and bittersweet to explore. It is an universally appealing theme because if you haven't been through this, you probably will at some point. The fear of losing love is the dark side. But the wonderful side is the feeling that you get when you fall in love.

That's so true and speaks to my heart....