Oh! Darling by The Beatles is a passionate plea from someone who fears losing their lover. The song embodies themes of love, desperation, and regret. The narrator begs their partner to stay, promising that they'll be faithful and devoted. Key poignant moments include the repeated lines 'Oh! Darling, if you leave me, I'll never make it alone' and 'Believe me, I'll never let you down,' which highlight the intense emotion and urgency behind the narrator's plea.