The song "Aku Bukan Pilihan Hatimu" by Ungu describes a love that is unrequited or one-sided. The lyrics express the feeling of not being chosen or desired by the person they love. The song suggests that it may be predetermined or destined that they will not be together. Despite this, the singer wants the person to always know that they love them throughout their life. They believe that their love is true and will last forever. The chorus emphasizes the singer's belief that their love is only for the person they long for. They are confident that their love will remain constant until the end of their life. Every breath they take is dedicated to this person, as they are the only one they always miss and desire. Overall, "Aku Bukan Pilihan Hatimu" portrays the pain and longing felt when someone's love is not reciprocated. The singer expresses their deep and everlasting love for someone who may not feel the same.