Pasajero is a fascinating word with a double meaning. It can mean 'fleeting' or 'temporary', but it also literally translates to 'passenger'.
In the song, Aitana sings about "un amor que siempre será pasajero" (a love that will always be fleeting). This beautifully captures the bittersweet feeling of a love that you know won't last, as if it's just a passenger passing through your life. It's a poetic way to describe a temporary romance.
This song is a total heartbreaker, all about the moment a relationship ends and the feeling that you just can't accept it. Aitana starts by begging her partner to “Dime que es mentira, que me lo soñé / Y que tú ya no te vas” (Tell me it's a lie, that I dreamed it / And that you're not leaving anymore). She knows it's over, but she's stuck in that painful moment, trying to stop time by not sleeping so the clock won't move forward.
The chorus is just devastatingly direct. She repeats “Si yo te quiero, te quiero y te quiero” (If I love you, I love you, I love you) and then asks the impossible question, “¿Dónde guardaré este amor si tú te vas?” (Where will I keep this love if you leave?). Cali Y El Dandee's verse adds a clever math metaphor to the pain, describing how the love equation is all wrong now: “Restas tus ojos cafés / Pero les sumas sufrimiento” (You subtract your brown eyes / But you add suffering to them). Ultimately, the song is about loving someone too much, so much that moving on feels impossible. The final line says it all: “¿Cómo pretendo no echarte de menos / Si te amé de más?” (How can I pretend not to miss you / If I loved you too much?).