Purely subjective but this book was SO GOOD. I needed this rollercoaster and it hit home way too hard. Is this a romance? Not really rather following characters. Is this accurate representation? I don't know about the addiction part but dealing with mental illness and how dynamics change was WAY too accurate. Lily and Lo have my heart and felt really realistic. The problems they face and behaviour just made sense. Besides, the side-characters are pretty interesting and add to the story. 
Yes, it's character based and probably over dramatic but if you like the characters the ending will have you in a chokeholed (at least I was lol). Not overthinking this review but straight off the bat and influenced by the emotional ending it's five stars.