What is Scout's assessment of Jem's changed behavior after he won't let her kill the roly-poly?

Scout is confused and frustrated by Jem's changed behavior after he refuses to let her kill the roly-poly. She perceives his actions as a sign of growing maturity and sensitivity, which she struggles to understand. To Scout, Jem's decision reflects a shift towards empathy and compassion, particularly towards innocent creatures, indicating his development into a more thoughtful person. This moment illustrates the complexities of their relationship as Scout grApples with Jem's evolving values.