The song "Mary Lee" by Jamie T tells the story of a person reflecting on their past relationship with someone named Mary Lee. The narrator regrets their actions in the relationship, feeling foolish and regretful for letting her leave. The lyrics suggest that the narrator was young and immature, engaging in fights and struggling with their identity. They feel that their current appearance doesn't suit them and has caused them to lose touch with reality. In an attempt to change themselves, they mix qualities of their parents and create a more sophisticated image for themselves. The chorus emphasizes the longing and regret the narrator feels whenever they think about Mary Lee. They see her leaving when they look out of the window, hear her breathing when they sleep, and cannot believe their own foolishness that led to her departure. The song also touches on themes of friendship and shared experiences. The narrator describes their bond with Mary Lee as being "thick as thieves," implying a close and loyal friendship. They reminisce about their teenage years and the experiences they had together, including blowing off steam and forgetting past hardships. However, the narrator ultimately feels alone as they drive away from the places they once knew. Overall, "Mary Lee" is a nostalgic and regretful song about a lost love and the narrator's desire to reconcile their mistakes.