Marioneta literally means "puppet" or "marionette". It's a fantastic and visual word that you won't find in most love songs.
In "Culpa Al Corazón," Prince Royce uses this metaphor to express a total loss of control over his emotions. He sings, "Soy sólo una marioneta sin control de su sentir" (I'm just a puppet with no control of its feelings), blaming his heart for his desperate actions. This poetic image perfectly captures the feeling of being helplessly pulled by the strings of love.
Ever done something completely irrational because you were head over heels in love? That is the exact excuse Prince Royce is serving in "Culpa Al Corazón" (Blame the Heart). Instead of taking responsibility for his obsessive habits, he shifts all the blame straight onto his chest. He stays up all night, loses his mind over the sparkle in her eyes, and calls her in the middle of the night. His defense? "Y por mis llamadas de madrugada / Culpa al corazón" (And for my late-night calls / Blame the heart). He literally argues that his frantic texts and phone calls aren't even his fault: "No pienses que soy yo" (Don't think it's me).
To make his case even more dramatic, he compares himself to "una marioneta sin control de su sentir" (a puppet with no control over its feelings) and "un pasajero con destino a ser feliz" (a passenger on a journey to be happy). He even tries drowning his sorrows, singing "Le he contado mi tristeza / A un par de copas de ron" (I told my sadness to a couple glasses of rum), but admits alcohol only helps a little bit compared to her love. Throughout the track, he repeatedly calls her "mami" (a common Dominican term of endearment for a woman, like "babe" or "honey"). It is a smooth, wonderfully over-the-top bachata confession about being completely helpless in love.