Why doesn't Jim deliver billy bones request to the doctor?

Jim doesn't deliver Billy Bones' request to the doctor because he is overwhelmed by fear and uncertainty about the pirates' intentions. After discovering the dangers surrounding Billy's situation, Jim decides to prioritize his own safety and the safety of his mother. Additionally, he feels a sense of loyalty to the mysterious and dangerous world Billy represents, which complicates his decision-making. These factors ultimately lead him to withhold the message from the doctor.