Trastornado means 'disturbed,' 'unsettled,' or even 'deranged.' It's a powerful adjective that goes beyond just being sad.
In this song, Bad Bunny sings, "Desde que te fuiste sigo trastornado" (Since you left, I'm still disturbed). He uses this intense word to express how the breakup has deeply affected his mental state, leaving him feeling completely messed up and unable to move on. It's a very raw and emotional way to describe heartbreak.
Ever found yourself staring at an old picture and wondering 'what if?' That is the entire vibe of Bad Bunny's Si Estuviésemos Juntos. The Puerto Rican superstar gets stuck in his own head, wondering if his ex is kissing someone else right now while he keeps replaying their past. He holds onto an old photo of them dancing back when they were underage, admitting he still misses her on Valentine's Day and Christmas: "Te extraño el catorce y en la navidad" (I miss you on the fourteenth and at Christmas). He even brings up intensely personal memories from high school, like hooking up in the back of his car: "en la parte posterior del carro pa' los tiempos en la superior" (in the back of the car during high school days).
Bad Bunny keeps things super direct and unfiltered. He confesses that he tries to move on at strip clubs ("Ahora me paso en el putero"), but no one compares to her. His head is literally spinning from overthinking as he listens to "Deuces de Ñengo y De La, no la de Chris Brown" (Deuces by Ñengo and De La, not the Chris Brown one), giving a shoutout to the classic Latin urban remix by Puerto Rican artists Ñengo Flow and De La Ghetto instead of the American original. It is an honest look at how hard it is to let go when you cannot stop asking, "¿qué hubiera pasado si estuviésemos juntos?" (what would have happened if we were still together?).