Se esfumó comes from the verb esfumarse, which means "to vanish" or "to disappear into thin air," much like smoke (fumo). It's a beautiful and slightly dramatic word you won't hear every day.
In the song, the artist sings "Todo lo que fuimos se esfumó de aquí" (Everything we were vanished from here). He uses this word to powerfully describe how the entire relationship and all its memories simply disappeared, leaving an empty space behind. It perfectly captures that sudden and complete feeling of loss after a breakup.
Spanish singer Íñigo Quintero teams up with Hey Kid for this upbeat pop track that deals with the messy, frustrating aftermath of a breakup. The singer admits that he took far too long to move on, singing "Porque yo he tardado tanto en olvidarte" ("Because I have taken so long to forget you"). He is stuck in that awkward state where he feels guilty for not being able to fix things, bouncing between "Será por ti" ("Maybe it is because of you") and "Será por mí" ("Maybe it is because of me"). To make matters worse, an ex shows up out of nowhere crying: "¿por qué volviste a mí / Si yo no era nada para ti? / Di porqué con la cara empapada" ("why did you come back to me if I was nothing to you? Tell me why with your face soaked in tears"). That blunt image of a tear-soaked face sums up the whole confusing situation perfectly.
While the pain is real—he says "Se me parte el alma" ("My soul breaks" or "My heart breaks", a common idiom for intense grief)—the track pushes toward independence. Instead of waiting around for someone who made him feel like "Nada de lo que hice valió para ti" ("Nothing I did was worth anything to you"), he decides to take control back. His ultimate goal is simple and honest: "Ser el dueño de mi tiempo y pensar en mí" ("To be the master of my time and think about myself"). It turns heartbreak into a clear reminder to stop wasting energy on someone who only reaches out when it suits them.