This song is a heartfelt plea from a man who has made a terrible mistake and is desperate to save his family. He's begging his partner to open the door and talk to him, emphasizing that their children shouldn't suffer for his actions. He feels like "el peor padre" [the worst father] and can't even look his kids in the face.
The core of his regret revolves around "Cinco minutos de placer" [Five minutes of pleasure] that he says "Me dañaron la vida que contigo formé" [damaged the life I built with you]. He admits to being a coward and not controlling himself, letting desire get the better of him. Now, he's lost and doesn't know what to do to prove his love and that he adores his family. He repeatedly asks for forgiveness, pleading, "Por favor no me dejes que me siento perdido" [Please don't leave me, I feel lost], calling those five minutes his "peor castigo" [worst punishment]. It's a raw and emotional confession of regret and a desperate fight to keep his family together.