Ubícate literally translates to "locate yourself," but it's a popular colloquial command that means "get real" or "get a grip." It’s a sharp way to tell someone they're being delusional and need to face reality.
In the song, the singer uses it to shut down their ex, singing "...lo que viviste conmigo, ubícate" (what you lived with me, get real). It's a powerful and direct dismissal, telling the ex to accept that the dream is over and the relationship is finished for good.
This song is the perfect soundtrack for when you are completely, totally, 100% finished with someone. The whole idea is right there in the title: "Perdonarte, ¿Para Qué?" [Forgive you, for what?]. The singer asks this question because they already know the answer: forgiving their ex would just lead to being let down all over again. They've heard the apologies before, and now they say, "Ese chiste ya no me hace gracia" [That joke isn't funny to me anymore]. It's a powerful and final goodbye.
The song is full of blunt instructions for the ex, starting right away with "Supérame, olvídame" [Get over me, forget me]. The singer isn't just breaking up; they're closing the book on the relationship and telling their ex they were lucky to have them, calling their time together "la mejor historia que has leído" [the best story you have ever read]. The message is clear: you had your chance, you blew it, and now it's too late. As the song says, "Y ya el avión se te fue" [And your plane has already left].