This song is all about a guy who really messed up a good relationship, and now another guy is stepping in to pick up the pieces! The lyrics tell a story from the perspective of the new guy who's been watching the ex-boyfriend treat his girl badly. He sees her "llora'" [cry] and "sufri'" [suffer] because of the ex's actions, especially for "andar con zorra'" [hanging out with sluts].
The new guy isn't shy about saying, "Fuiste tú el que perdió" [You were the one who lost]. He's been there for her, being her "paño de lágrimas" [shoulder to cry on], and now he's making his move. He's confident that he can treat her better, promising to "poner a entonar como Frank Sinatra" [make her sing like Frank Sinatra] and even saying, "En tu cama me la comía" [In your bed I ate her up] – a pretty blunt way of saying he's moved in! It's a bold and a bit aggressive take on a rebound, with the new guy celebrating his victory over the ex who "nunca valoraste el tiempo que perdió" [never valued the time she lost].