While bipolar is a direct cognate, its colloquial use in this song is what makes it so interesting for a learner. Peso Pluma isn't making a clinical diagnosis, but rather using the word to express intense, conflicting emotions about a relationship.
He sings, "A veces no me entiendo, soy bipolar" (Sometimes I don't understand myself, I'm bipolar), capturing the emotional whiplash of going from wanting his ex back to deciding he's better off alone. It's a powerful, modern, and memorable way to describe the rollercoaster of a difficult breakup.
Ever tried to forget someone but found yourself calling them late at night? That's exactly where this song starts. Peso Pluma admits, "Prometí que iba a olvidarte / Pero me fallé" (I promised I would forget you / But I failed myself). He's stuck in a loop, feeling weak and reaching out, even though he knows he shouldn't. It's a classic post-breakup struggle, where your heart says one thing and your head says another.
But then the mood completely flips. The singer declares, "A veces no me entiendo, soy bipolar" (Sometimes I don't understand myself, I'm bipolar), describing his wild emotional swings. One minute he's heartbroken, the next he's decided to focus on himself and his career, saying he'd rather "hacer dinero / Que malgastar mi tiempo con puros cuentos" (make money / than waste my time with pure stories). This back-and-forth between wanting love and wanting to be independent is what makes the song so relatable and gives it its name.