You're Going to Lose That Girl by The Beatles is a song about friendship, love, and the consequences of neglecting a romantic relationship. The song's narrator warns a friend that if he doesn't pay more attention to his girlfriend, he risks losing her to someone who will. Key themes include loyalty, the urgency of taking action in a relationship, and the competitive nature of love. Poignant moments include the chorus, where the narrator repeatedly emphasizes, with a sense of inevitability, that the girl will leave if she continues to feel neglected.