Jungkook's song "Never Not" is about a past relationship that was beautiful but also tragic. He reflects on how they lost themselves at a young age but found each other and created unforgettable memories. Even though the relationship ended, the memories they shared still hold a special place in his heart. Jungkook also acknowledges that he will always think about his past love, even as he moves on with his life. The song emphasizes that this kind of love only comes once in a lifetime and will always be compared to future relationships. Overall, "Never Not" is a heartfelt and nostalgic tribute to a past love and the memories they created together.