Rehacer literally means "to remake" or "to redo." It combines the prefix re- (again) with the verb hacer (to make/do).
In this song, Camilo uses it in the powerful phrase "rehacer tu vida" (to rebuild your life), which means to start over after a significant setback. The emotional core of the song is revealed when he accepts his ex will move on, but then heartbreakingly confesses "yo no puedo rehacer la mía" (I can't remake mine), expressing that he's completely stuck in the past.
Colombian pop singer Camilo hits you right where it hurts with "Manos De Tijera" (Scissors Hands). He kicks things off with drama right away: "Le dije al cielo que te fuiste y empezó a llorar" ("I told the sky that you left and it started to cry"). But then he drops the grand poetry and brings the heartbreak into the modern, everyday world. The sharpest cut comes from a tiny change on a smartphone: "El día que le borraste a mi contacto el corazón / Ese día me borraste el corazón" ("The day you erased the heart from my contact name, that day you erased my heart"). Losing a saved emoji has never sounded so brutal.
The rest of the song spirals through that familiar post-breakup paranoia. He pictures the inevitable day she posts a photo in someone else's arms, dreading when someone else sings her happy birthday. Through it all, he keeps begging for reassurance, asking "dime si me echas de menos tan solo un poquito" ("tell me if you miss me just a little bit") because, for him, breathing without her feels impossible. It is messy, clingy, and completely honest about how hard it is to move on when the other person already has.