Arrepentí is the past tense of the verb arrepentirse, meaning "to repent" or "to regret". It's a strong emotional word that conveys deep remorse.
In the song, Don Omar sings, "Pero me arrepentí" (But I repented/regretted). This word is central to the song's narrative, as the singer expresses regret for how he treated his partner, leading to a complex situation where his friend is now caring for her. It highlights a pivotal moment of self-reflection and consequence.
This song is written as a letter from a man in prison to a close friend. He confesses how badly he treated a woman he loved, admitting he made her cry and lost her because of his own mistakes. From behind bars, he asks his friend, someone who grew up with him, to look after her now that he can't. As the letter goes on, guilt turns into jealousy: he pictures his friend actually being close to her and can't stop asking himself why. It's a story about regret, trust, and the strange pain of asking someone you love to care for someone you love.