The song "Nobody But Me" by Michael Bublé is about a man who is very possessive and protective of his romantic partner. He talks about feeling jealous and reckless when thinking about his partner and wanting to keep them all to himself. The lyrics also mention how his parents taught him to share, but he doesn't care and wants his partner all to himself. The song portrays the singer's determination to keep his partner for himself and not wanting anybody else to love or even think about them. He expresses his love and possessiveness in a playful and light-hearted manner, with a catchy melody and a trumpet solo adding to the fun and upbeat vibe of the song. Overall, "Nobody But Me" is a light-hearted and catchy song that showcases the singer's playful and affectionate side, as he affirms his love and possessiveness towards his romantic partner.