Desilusión translates to "disillusionment" or "disappointment." It's a strong emotional word that goes beyond simple sadness, implying a loss of hope or belief in something.
In the song, Yiyo Sarante sings, "Y es que mi corazón para tanta desilusión él no fue diseñado" (And my heart was not designed for so much disillusionment). This word perfectly captures the depth of betrayal and heartbreak the singer feels, making it a powerful and relatable term for anyone who has experienced a profound letdown in love.
"Corazón de Acero" is a bachata song about moving on after a relationship that stopped working. The singer tells his ex that staying together didn't pay off, and that she was the one who hurt him first and ended their love.
He wishes she had at least left him a "heart of steel" instead, tough enough not to feel the pain. But over the course of the song, he gets there anyway: he says he's finally breathing again and has replaced her, all thanks to her own cruelty pushing him forward.
The chorus repeats the idea that he needed someone else's affection just to forget her, which is why it comes back again and again toward the end of the song.