Beneficio de la duda is a powerful phrase that translates directly to "the benefit of the doubt". It's a plea for someone to believe you have good intentions, even when circumstances look bad.
In this emotional song, the singer asks his partner for exactly that: a second chance. He's asking her to set aside her judgment and listen to his side of the story, hoping to repair their relationship. It's the central theme and title of the song, making it a key phrase to understand.
We have all been in the doghouse, but Grupo Firme turns that awkward spot into an art form here. The singer knows he messed up. He admits right off the bat, "No me merezco el beneficio de la duda" ("I don't deserve the benefit of the doubt"). His side of the story probably will not save him either, but he is still begging for one more chance to explain himself. Instead of acting proud, he shoots straight and says life apart is going to suck for both of them: "Se nos va a poner difícil eso de andarle buscando en otras gentes otros modos, otros cuerpos, otras bocas" ("It's going to get tough trying to find other ways, other bodies, other mouths in different people"). It is blunt, slightly shameless, and completely honest about how exhausting dating someone new really is.
What makes this track fun for Spanish learners is how natural the everyday phrases are. When he says "le demos vuelta a la hoja" ("turn the page"), he is using a classic Spanish idiom that means moving on and letting things go. He also complains that they shouldn't waste time "sufriendo por estupideces" ("suffering over stupid things"). The word "estupideces" comes from estúpido, but here it works like "nonsense" or "petty foolishness." He knows what they had was good ("estábamos viviendo algo bonito"), so he makes one final, stubborn pitch: "Solo dame el beneficio de la duda y no te vas a arrepentir" ("Just give me the benefit of the doubt, and you won't regret it").