Desvelo is a powerful word that literally means "sleeplessness" or the state of being awake. It comes from the verb desvelarse (to stay up all night).
In the song's opening line, Becky G sings, "Me desvelo y vivo apasionada," which means "I lose sleep and live passionately." This one word perfectly captures the all-consuming nature of a love so intense that it disrupts even the most basic need for rest, painting a vivid picture of lovesick obsession.
Becky G takes on pure, old-school romantic misery in "POR UN AMOR", and she does not hold back on the drama. The narrator is completely consumed by a past flame, staying up all night and confessing, "Tengo un amor que en mi vida dejó para siempre amargo dolor" ("I have a love that left bitter pain in my life forever"). She takes heartbreak to its absolute limit, crying out, "He llorado gotitas de sangre del corazón" ("I have cried tiny drops of blood from my heart"). Yes, crying literal drops of blood sounds totally extreme, but that is the point: the wound is deep, leaving her with an "alma herida sin compasión" ("a wounded soul with no mercy").
When listening, pay close attention to how she repeats "Pobre de mí" ("Poor me"). It is a classic dramatic phrase used across Spanish ballads to wallow in personal ruin. She follows it with the bleak line "Esta vida es mejor que se acabe, no es para mí" ("It is better that this life ends, it is not for me"), before pleading with her own chest to stop hurting: "Ay, corazón, no sufras más" ("Oh, heart, do not suffer anymore"). Her chest still beats only for the person who shattered it. It is grand, slightly melodramatic, and perfect for learning how Spanish uses vivid physical imagery to talk about unbearable loss.