Playlist for the Dead discussion

I thought this was a good book, but some parts of it were a stretch and I was still left with a lot of questions at the end. After Sam finds his best friend who committed suicide, he listens to Hayden's playlist to try and piece together clues to why Hayden killed himself. At his funeral, Sam calls out the "bully trifecta" who made Hayden's life miserable, but he also meets a girl named Astrid who ends up being behind the attacks of Hayden's bullies. The ending is not really what I expected, and the story is left open with not many answers. Still a good book though.