Quedar en visto is a modern slang phrase that literally means "to remain seen." It perfectly describes the specific, frustrating feeling of sending a message, seeing the other person has read it (like the blue checkmarks on WhatsApp), but getting no reply.
In the song, the singer writes messages to his ex but then deletes them, singing, "Pa' quedar en visto, ese mal rato, mejor me lo ahorro" (To be left on read, that bad moment, I'd rather spare myself). This phrase perfectly captures the mix of pride and vulnerability in modern-day heartbreak.
This song is all about that terrible feeling when you miss someone so much, but your pride gets in the way. The singer is stuck in a loop. He admits, "Te escribo mensajes / Todas las noches / Pero los borro" (I write you messages / every night / but I delete them). He's too scared of being ignored or, as he puts it, "quedar en visto" (being left on read).
He keeps repeating that his pride is huge and weighs him down, but he still wants this person to know how he feels. The chorus is what he wishes he could say: "Quisiera pedirte que vuelvas, que vuelvas" (I'd like to ask you to come back, to come back). He feels like he's lost his soul without them, which is super dramatic but gets the point across. It's a classic battle between the head and the heart.