Unsatisfying Endings

I think I made this list because someone in the Internet - a man? perhaps - said that teen books were trite and always had a neat, pat ending.

Aristotle and Dante Discover the Secrets of the Universe
Ask the Passengers
Boxers
Charm & Strange
Code Name Verity
Conviction
Fans of the Impossible Life
Going Bovine
Grasshopper Jungle
In Darkness
Kingdom of Little Wounds
Long Way Down: The Graphic Novel
Mermaid in Chelsea Creek
Midwinterblood
More Happy Than Not
Okay for Now
Orchards
Reality Boy
Rotters
Saints
Scowler
Sex & Violence
The Disreputable History of Frankie Landau-Banks
The Miseducation of Cameron Post
The Sacred Lies of Minnow Bly
The Sea of Tranquility
The sin eater's confession
The Strange and Beautiful Sorrows of Ava Lavender
The Waking Dark
The Wednesday Wars
The White Darkness
When You Reach Me
Where Things Come Back
Winger