no it's not heartbreaking or mentally damaging, no billie is not an absolute ass. SORRY I JUST WANT TO READ WITHOUT BAWLING ALSO blue hair bil 😏 their in highschool, billies in hannahs older brothers grade, maggie (billie's mum duh) and montana (hannah's mum) have known each other since highschool and have been best friends ever since so the family's are super close, and live next door to each other. that's all you needa know I think, thanks for choosing to read this, LOVE YA