The Rejected (Book 3)
[COMPLETED] Jasper, an orphaned street rat, was taken in to live and train to join the royal guard by the queen herself. Learning to become a guard was easy, but fitting in was hard. Neither accepted in the town nor accepted in the castle, Jasper was truly alone. The only person he trusted was his best friend Cecelia, who also happened to be the princess. Now that the princess was no longer a little girl anymore, she had started to catch the eyes of many young suitors. Teaming up with the last person he expected, Jasper is set on a mission to protect his best friend. However, no one warned him that he needed to learn how to protect himself.
Third book to The Selected trilogy (Order: The Selected, The Protected, The Rejected).
Can be a stand alone but has a few spoilers.