Ann Brashares said this quote

Lena, listen to me, okay? We don't have much more time here. You are in love. I've never seen anything like this before. You have to be brave, okay? You have to go and tell Kostos how you feel. I swear to God if you don't, you will regret it for the rest of your cowardly life.''What if he doesn't like me back?''That's what I mean about being brave.