Antecedentes literally translates to "background" or "record," often referring to a criminal record. It's a strong and somewhat formal word that stands out in a song about a relationship.
In this song, the phrase "Tú ya traías antecedentes muy malos" (You already had a very bad record) is used metaphorically. It implies that the person had a history of bad behavior in relationships, warning the singer of potential heartbreak. This makes the word intriguing and gives it a deeper meaning within the context of the lyrics.
Banda MS's song "Antecedentes" is a really direct and honest look at a relationship that was doomed from the start. The singer admits, "Yo te amaba y mucho, Más de lo que tú te merecías" [I loved you a lot, more than you deserved], making it clear they gave everything. But their partner had a history, or "antecedentes" [background/record], that wasn't good. The singer knew the risks, even saying, "Aun sabiendo que la probabilidad de ser feliz era de cero" [Even knowing the probability of being happy was zero], but they took a chance anyway.
It's a classic tale of someone trying to change another person, but ultimately realizing it was a lost cause. The singer feels like they wasted their time, "Yo perdí mi tiempo" [I lost my time], but also points out what the other person missed out on: "También te perdiste de los mejores besos" [You also missed out on the best kisses]. It's a blunt, almost sassy way of saying, 'You messed up, and you're the one who truly lost out.'