Culpable means 'guilty' or 'at fault'. It's a powerful word that reveals the singer's deep regret over a past mistake.
In the song, the narrator admits, "Y aunque yo sea culpable de aquella triste separación" (And even though I may be guilty of that sad separation). This confession adds a layer of sorrow and personal responsibility, making her plea for reconciliation much more emotional and compelling.
In "Cielo Rojo", Ángela Aguilar takes on a classic Mexican huapango full of dramatic heartbreak and regret. Walking alone without her lover's affection ("Sola, sin tu cariño voy caminando" [Alone, without your affection I am walking]), the narrator searches for answers from an empty sky that refuses to answer her back ("Ni el cielo me contesta" [Not even the sky answers me]). She admits that her own actions caused their painful split with the line "Y aunque yo sea culpable de aquella triste separación" [And even if I am to blame for that sad separation]. Surrounded by shadows of doubt and jealousy, she begs her ex to wipe the slate clean, pleading "Olvida lo pasado, ya no te acuerdes de aquel ayer" [Forget the past, do not remember that yesterday anymore].
The central visual of the track contrasts dreaming versus waking up. When she falls asleep, she dreams of traveling together toward a peaceful, bright sky: "Sueño que vamos los dos muy juntos a un cielo azul" [I dream that we both go together to a blue sky]. But waking reality hits hard: "Pero cuando despierto, mi cielo es rojo, me faltas tú" [But when I wake up, my sky is red, you are missing]. In Mexican ranchera traditions, a cielo rojo (red sky) symbolizes burning passion, loneliness, and despair. She is not ready to let go, offering to track them down herself if it means getting one more chance at love.