I am a big ball of contentedness and lovelyness and Rainbow Rowell lemme hug you. 
 My only advice: don't read this book when you are happy. Read it when you are sad and just wait for the good feelings to roll in. 
 Although: (view spoiler)[ That was the meanest 'fade to black' scene ever. I know that Rainbow can write awesome sex scenes (see: Eleanor & Park) and I do feel slightly robbed that she didn't include one here. Says the pervert. (hide spoiler)]