Arrepentí is the past tense of the powerful verb arrepentirse, which means "to regret" or "to repent". It's a word packed with emotion, used when someone feels deep remorse for a mistake they've made.
In the song, the singer looks back on the relationship and confesses his sorrow, singing, "Si fallé me arrepentí" (If I failed, I regretted it). This one word perfectly captures the song's heartbreaking theme of longing and wishing you could undo the past.
Have you ever looked at an ex's social media and instantly regretted it? That sting is the entire engine behind "Cien" by CNCO. The title translates to "One Hundred," and the opening line does not hold back on the drama: "Duele cien veces más / Que si se hundiera un clavo en mi piel" ("It hurts a hundred times more / Than if a nail sank into my skin"). The singer is scrolling, spots his former flame with a new partner, and simply refuses to accept reality ("No aprendí aceptar que seas de otro" ["I didn't learn to accept that you belong to someone else"]). Instead of moving on, he is stuck second-guessing every choice he made, asking himself if he messed up, and insisting that this new guy cannot possibly love her the way he did.
What makes the track so catchy is how blunt and dramatic the jealousy gets. The singer completely drops his pride, confessing that he is exhausted from pretending everything is fine ("De fingir, me cansé" ["I got tired of pretending"]). He even claims he went down on his knees to apologize ("De rodillas ante ti" ["On my knees before you"]) and gave her the entire sky ("Si hasta el cielo te lo di" ["If I even gave you heaven"]). It is over-the-top, desperate, and totally honest about how messy a breakup feels when you are convinced the other person made a huge mistake leaving you.