Remordimientos translates to "remorse" or "regrets." It's a strong, evocative word that delves into the emotional consequences of actions, particularly those that are hidden or forbidden.
In the context of "Si Ella Supiera," the word appears in a line about "la traición puerta con puerta con esos remordimientos" (betrayal door to door with those regrets). This highlights the secret nature of the affair and the heavy emotional toll it takes, making it a compelling and thought-provoking choice for a notification.
Ulises Bueno's "Si Ella Supiera" is a really intense song about a secret love. The singer is imagining what would happen if "she" (presumably his partner) found out about this hidden relationship. He describes late-night dances under car headlights, with the "luz yulico testigo" [Yulico light as a witness], and how every "te amo" [I love you] makes time freeze.
He feels like everything forbidden disappears when he's with this other person, even saying that "puede amarse los desconocido" [the unknown can be loved]. He even feels a "sismo" [earthquake] that an innocent life inside him could feel, and that the mirror shows him a different person. He knows his partner suspects nothing, but he's aware that "en el silencio vive la traición puerta con puerta con esos remordimientos" [in silence, betrayal lives door to door with those regrets]. It's a powerful look at the thrill and guilt of a secret affair.