Aimee by Mary Beth Miller

Geez, what a depressing book. You may not get the cover art when you first pick up the book; I know I didn't. But let me just say it has several symbolic meanings, all of which include spoilers, so read the book if you're that curious.
Aimee is actually told from the point of view of Aimee's best friend, whose name remains unknown till the end of the book, practically. We do discover her nickname is JK (which has got to suck) but her name is kept a secret, which I thought was pretty interesting, especially for the author to even think of that.
Anyway this girl who remains unnamed was best friends with Aimee. I say was because Aimee is dead. She committed suicide and this girl is accused of helping her. The book takes place after the trial where she is acquitted, and she's trying to piece her life back together with her shrink and her journal. So slowly we start to see where Aimee went wrong through her best friend's journal. These flashes into the past get very intriguing and disturbing to read as you keep on, just a warning, although they're still good and a bit heartbreaking at parts.
The best friend is also not allowed to talk to any of her old friends from the pre-Aimee-death days, I guess because their parents were afraid she'd "help" kill them too. So this girl becomes friends with a girl at her new school who also has suicidal issues. (Don't the suicidal people always seem to be magnetized towards each other in books?) Her name is Hope, and she has an extremely twisted family life. This girl has to discover what she can do to help and how she failed Aimee, basically.
This book deals with some interesting issues on how humans affect each other. Like, if your friend says they need help when really they needed it a long time ago and you just kept pretending everything was okay and by the time you stopped pretending it was too late. And also how technically you can be trying to help but really just hurting, and sometimes the best thing to do is involve someone else while other times it's simply not needed.
But yes, this book was very depressing-- I mean, look at the subject matter-- but it has some great issues that make you think about what you would do in the situation this girl was in. Or Aimee, for that matter. ♠♠♠