Christmases When You Were Mine by Taylor Swift is a melancholic holiday song reflecting on the bittersweet memories of past Christmases spent with a former lover. The song captures the loneliness and sadness felt during the festive season after a breakup. Key themes include nostalgia, longing, and the pain of separation, juxtaposed against the typically joyful backdrop of Christmas. Particularly poignant moments include the chorus, where she recounts specific memories and the feelings they evoke, emphasizing the contrast between the happiness of the past and the sorrow of the present.