Divulga means "reveals" or "discloses." It's a less common word than simply saying "dice" (says) and carries a stronger implication of spreading information, often something that was previously hidden or private.
In the context of the song, the singer uses it to express how his ex-partner "divulga que yo fui el que se equivocó" (reveals/spreads that I was the one who made a mistake). This highlights the public nature of her accusations and the impact it has on his reputation, making it a powerful and emotionally charged word choice.
Have you ever been so deep in a relationship that you couldn't see how bad it was until it ended? That's exactly what Virlan Garcia sings about in "El Día Que Te Fuiste" [The Day You Left].
He opens up about the sadness and betrayals he felt, saying, "Sí me invade la tristeza, Sí me duelen las traiciones" [Yes, sadness invades me, Yes, betrayals hurt me]. But the real twist comes when he realizes that the day his partner left, he actually became happy! He admits he was an "idiota" [idiot] for not seeing through her perfect smile. It's a powerful song about finding freedom and healing after a tough breakup, realizing that sometimes, the end of one chapter is the beginning of a much happier one.