Thought of You by Justin Bieber is a pop song that delves into themes of love, longing, and the emotional impact of thinking about a past relationship. The lyrics highlight the struggle of moving on and the constant reminder of a former lover. Key themes include heartache, reminiscence, and the internal conflict between wanting to forget but constantly being reminded of the one you loved. Particularly poignant moments in the song often revolve around Bieber's reflective and emotive delivery, capturing the essence of youthful love and the difficulty of letting go.