Non-spoiler review.
This book is an absolute masterpiece. I've read this two times, once a couple years ago and now for the second time as I have just acquired the sequel, "If Only I Had Told Her". I will admit that I am a very emotional reader, but I feel like this book could make even the toughest people cry. The emotions this book makes you go through are unlike any other. Super excited to read the sequel. I highly recommend this book.