It just...life.

"As we grow up we learn that even the one person who wasn't meant to let you down probably will, you will have your heart broken probably more then once and its harder every time. You'll break hearts too so remember how it felt when your was broken, You'll fight with your best friend.
You'll blame a new love for things an old one did. you'll cry because time is passing too fast and you'll eventually loose someone you love. so take too many pictures, laugh too much, and love like you've never been hurt because every sixty seconds you spend unhappy is a minute of happiness you will never get back."