Advertí means "I warned" or "I advised." It's the past tense of the verb advertir.
In the song, the phrase "Te lo advertí" (I warned you) is repeated several times, highlighting a central theme of regret and consequences. The singer is telling someone that they were warned about the outcome of their actions, making it a key word for understanding the song's narrative.
Paquito Guzmán's "Te lo Advertí" is a fantastic salsa track where he's telling an ex-lover, "I warned you!"
He's moved on and is feeling great about it. He sings, "aprendí a vivir sin poquito hoy tus caricias en mi piel no necesito" [I learned to live without you, today I don't need your caresses on my skin]. He even admits he was once happy with this person, but then he realized he didn't exist for them. He found out their nights weren't his, and he lost them like anyone else. Now, he's firm: "conmigo no se juega fácilmente" [you don't play with me easily]. He's learned to live without them, and he's not looking back. He even mentions that there's another family now, and he's done crying over a love that wasn't meant to be. It's a powerful declaration of independence!