Olvidarte means "to forget you." While "olvidar" (to forget) is a common verb, its use here in the infinitive, directly addressing the pain of trying to forget someone, makes it particularly poignant and central to the song's theme.
Arcángel repeatedly asks, "¿Cuánto cuesta? Olvidarte, ¿cuánto cuesta?" (How much does it cost? To forget you, how much does it cost?). This highlights the emotional cost of moving on, contrasting it with the material wealth he boasts about. It's a relatable and powerful question that drives the song's narrative.
Arcangel and Grupo Firme open with a receipt: Balenciaga bags, Prada glasses, a Van Cleef watch, a Richard Mille, a Patek Philippe, each one priced out loud. All that counting sets up the one question in the song that has no number: "¿Cuánto cuesta? Olvidarte, ¿cuánto cuesta?" [How much does it cost? To forget you, how much does it cost?]
He tries spending his way past it anyway, a Ferrari, a night with someone new who "no tenía tu flow" [didn't have your flow], perfume for somebody else. None of it lands. He keeps coming back to the same line: "Que de tanto pensarte me está doliendo un montón" [Thinking about you so much, it's really hurting me a ton]. By the end he's ready to trade everything he just bought for an answer: "Yo hago lo que sea, pongo en venta el corazón" [I'll do whatever it takes, I'm putting my heart up for sale].