Nessecito una canci�n that decscribes...?

okay so this dude says I'm the world to him and I'm his secret lover, el no le dice a su novia ke YO soy la due�a de su cama.. y puess yo lo kiero un chingo y el Cree ke yo no se nada pero i do .. I need a song in Spanish ke dice something about my situation or similar like I'm not stupid to see what he's hiding or how he 'loves' me but her at the same time ... I need this pronto!! Please. I'm begging /: