Disfraz means 'disguise' or 'costume'. It's a vivid and slightly dramatic word that isn't in every song, making it stand out.
Jay Wheeler sings, "Toda las promesas tuyas solo fueron un disfraz" (All your promises were just a disguise). He uses it to express a deep sense of betrayal, revealing that his ex's sweet words and promises were nothing but a mask hiding her true intentions. It’s a powerful metaphor for deception in a relationship.
Jay Wheeler is not holding back in this one! "Sin Ti" is a classic breakup anthem, but with a twist. He kicks things off by telling his ex, "No fuiste mala / Pero no fuiste suficiente" (You weren't bad / But you weren't enough). He's heard she's been talking badly about him, but he wants everyone to know his side of the story, pointing out all the bad attitudes he had to put up with.
The whole song is about him realizing he's much better off alone. The chorus is a simple, powerful declaration: "Aprendí a ser feliz / Sin ti, sin ti, sin ti" (I learned to be happy / Without you, without you, without you). He says the relationship made him feel sick and that she was full of bad intentions. Now, he's embracing the single life, saying "A estar soltero me acostumbré" (I got used to being single) and even bluntly states, "Anoche me acosté con otra" (Last night I slept with someone else) to prove he has moved on for good.