What is a paper heart? It's a heart that is very fragile or sensitive. That's the definition of these ten girls. With fragile hearts means a lot of heart break. What if your whole world crashed right before your eyes? Or if everyone who said that they loved you was a lie. What about if your life was a lie,your parents aren't your real parents? What about being depressed all the time? Or being bullied all the time. Would you have a paper heart then?