I love the care and research that went into writing a story with a topic as delicate as self harm , OCD and disordered eating, and what that looks like in someone in a relationship. This book tackles a lot while still keeping its charm and what made it obsessive. Narrative wise it’s obvious/quite blunt where the POV switches from the characters interacting to the author speaking through the characters about how to navigate X mental health issue, but despite the stiff language I feel those moments were necessary 
P.S. Justice for Ollie to get a dog in Heartstopper 5