Why did Krishna preach Gita only to Arjuna and not to any one else?

Krishna preached the Bhagavad Gita specifically to Arjuna because he was in a state of moral and emotional crisis on the battlefield of Kurukshetra, facing the dilemma of fighting against his own relatives and teachers. As his charioteer and guide, Krishna sought to impart spiritual wisdom, duty (dharma), and the nature of life and death to help Arjuna overcome his doubts and fulfill his Kshatriya duty. The teachings were tailored to Arjuna's unique situation, making them profoundly relevant to his internal struggle and decision-making.