Necio translates to "stubborn" or "foolish." It's a strong word that goes beyond simply saying someone is obstinate, implying a certain unreasonableness or folly in their stubbornness.
In the song, Carlos Rivera sings, "Tú tienes necio el corazón" (You have a stubborn heart). He uses necio to describe a heart that refuses to let go of a past love, even when the mind tries to convince itself otherwise. This personification of the heart as stubbornly holding onto feelings makes the word particularly poignant and relatable.
Have you ever tried to convince yourself you're over someone, but your heart just won't listen? That's exactly what Carlos Rivera and Reik are singing about in "Cuántas Veces" [How Many Times]. It's been a while since a relationship ended, described as losing a battle, and choosing distance instead. Even though time has passed, the singer still misses those kisses and hasn't found anyone who compares.
He promised himself he'd give up on the feeling, but it's still there. He keeps asking himself, "Cuántas veces tuve que ser fuerte?" [How many times did I have to be strong?] and "Mentirme que todo está bien, que te olvidé?" [Lie to myself that everything is okay, that I forgot you?]. He even wished on luck that when he saw them again, he'd be convinced he'd stopped loving them. But, as the song says, "Pero no lo he podido hacer" [But I haven't been able to do it]. It's a relatable feeling when your heart has a mind of its own, even if you try to say no.