I read "All the Bright Places" recently and I thought that book really made me cry. But holy crap "My Heart and other Black Holes" made me cry a RIVER. 
 So this seemingly dark novel is about a girl named Aysel. (Pronounced "uh-zelle". I had been pronouncing it a-sel until I figured that out lol) who wants to kill herself since she feels shamed of being her father's daughter, since her father is a murder. So she goes on this website where you can find suicide parters and she gets in contact with this user called "FrozenRobot" aka Roman. They meet up in person and agree to jump off a cliff together on April 7th. But Aysel finds herself becoming happier the more time she spends with Roman. She starts to wonder if she has a reason to live because she's with someone she's falling for. 
 Aysel is one of the most beautiful characters I know. She has so much emotion. One thing I love about her is how deeply affected she is when someone shows her just the tiniest amount of kindness. Roman once said to her "I can't help but care about the things you care about. I feel like we're kind of connected in that way now." And Aysel couldn't stop smiling when he said that. And it's usually hard for her to smile. It was just so sweet. She is also a physics nerd and pretty intelligent. I in no way saw her as a crazy killer like her father. She's the complete opposite. And she really had so much to live for. 
 Roman was a hard character for me to like at first as he seemed pretty bland. But he did grow on me. I felt so sorry for him. The reason he wants to kill himself is because he feels guilty about his little sister's death since she took a bath without him watching, had a seizure, and drowned. It has affected him so much that he wants to die because of it. But I never thought of that as a reason for him to kill himself. His family seemed to love him and Aysel grew to love him as well. I was waiting for him to realize that he could be happy. At least, I think his sister, Madison would have wanted that for him. 
 I wasn't into the romance at first but it eventually hooked my heart. Roman stated that him and Aysel have "chemistry" and I sure believe that. (view spoiler)[ What makes their love story so beautiful is that they originally sought each other out as suicide partners, but in the midst of it everything changed and they both realized they made each other happy. After I finished this book, I cried harder than I had in a while while reading a book because that thought touched me so deeply. The way these two characters came together in their circumstances was possibly one of there most beautiful things I've ever read about. (hide spoiler)] 
 (view spoiler)[ One teensy-tiny complaint about this book that I do have though is that we never got to see Aysel go see her dad. I was really interested on how they were going to act around each other and we never got that. I was looking forward to that *sigh*. (hide spoiler)] 
 As long as you're okay with reading about depression and suicide, I'd really recommend this book. I swear it will pull at your heart strings. 
 "You're like a grey sky. You're beautiful, even though you don't want to be."