Why is Grover upset in the Lightning Thief chapter 13?

In Chapter 13 of "The Lightning Thief," Grover is upset because he feels a deep sense of responsibility for protecting Percy and is distressed about the danger they face. Additionally, he is troubled by the fact that he hasn't been able to find and save the missing satyrs, particularly his friend, and feels the weight of his duties as a protector. This combination of worry for his friends and the challenges they encounter contributes to his emotional turmoil.