How does Bruno change throughout The Boy in the Striped Pajamas?

At the
beginning of the story, Bruno is depicted as a naive, self-centered child, who is upset that his
family is moving from Berlin to "Out-With" (Auschwitz). Bruno's concerns are selfish,
and he constantly complains about losing his friends and living in a cold, unfamiliar home.
Initially, Bruno hates Out-With and is confused by his surroundings.

Bruno is
too young and naive to realize that his new home is located nearby the concentration camp where
thousands of Jews are worked to death and murdered on a daily basis. As the story progresses,
Bruno eventually meets a Jewish boy named Shmuel who lives on the other side of the massive
fence. Bruno and Shmuel get along, and he begins visiting his new friend regularly.

As Bruno and Shmuel's friendship develops, Bruno begins to mature and no longer misses
his old home in Berlin. Bruno forgets about his old friends and demonstrates compassion by
continually bringing Shmuel portions of food. Bruno's ultimate act of selflessness takes place
toward the end of the story when he agrees to help find Shmuel's father on the opposite side of
the fence. Bruno puts on a prison uniform and sneaks underneath the fence. Bruno then searches
in vain throughout the concentration camp for Shmuel's missing father. Tragically, Bruno and
Shmuel are herded into a gas chamber and die alongside Jewish prisoners.

Overall, Bruno changes into a selfless, content adolescent, who thinks outside himself
and adapts to his new environment. Bruno demonstrates his maturation and moral development by
accepting his new life and selflessly helping his close friend Shmuel.