Sad Book Recommendations

I just want to read a book that'll make me cry, no matter how many times I've read it. It doesn’t need to have a happy ending. But I'd prefer a book that's not about breaking up or dating someone toxic. A book that's more focused on non-romantic relationships (like friendships or family) or mental health. It'd be nice if the book was related to loneliness, insecurity, being emotionally neglected, growing apart with loved ones, or negative body image. Please recommend me a good book