Tronar literally means “to thunder” or “to explode,” but in Mexican Spanish it can also mean to break something, ruin it, or even end a relationship. In the song, “arreglar lo que fui a tronar” means “to fix what I went and messed up,” making this a vivid and culturally interesting word.
“Noches Sin Fin” is a confession from a man who understands the damage he caused too late. He admits that he hurt her heart “sin piedad” [without mercy], while she healed on her own and he tried to forget her by spending time with other women. The phrase “lo que fui a tronar” [what I went and broke] is an informal way to say he ruined something, and “mija” is an affectionate Mexican expression, similar to “my girl” or “dear.” He knows he is responsible for his own suffering: “soy el culpable de mi infierno” [I am the one responsible for my hell].
The song’s strongest image is a lonely night spent asking the moon about the person he lost: “Noches sin fin, preguntándole a la Luna por ti” [Endless nights, asking the Moon about you]. He wants to hear her say “ven aquí” [come here], but the lyrics keep reminding him that she is leaving and will no longer be in his arms. “Ten piedad y quítame estas cadenas” [Have mercy and take these chains off me] makes his regret sound like a prison. He promises “No volverá a pasar” [It will not happen again], yet the hurt has already changed the situation: she has moved on, and he is left facing the present instead of hiding behind the clock or other relationships.