Thinking that King is embracing the girl, Mary Grace is convinced that he is a playboy. After graduating from the academy as Agent 690, she decides to accept West Point training being offered to her, and leaves the country with bitter feelings towards King.
Assuming King's behavior suggests he has feelings for Mary Grace, she believes he is likely a player. Following her graduation from the academy as Agent 690, she chooses to pursue West Point education and departs the country with strong negative emotions towards King.