Farsante translates to "impostor," "phony," or "faker." It's a powerful word used to describe someone who is insincere or pretends to be something they are not.
In this hit song, Ozuna uses this word for a dramatic confession, singing, "Yo sé que en el amor soy un farsante" (I know that in love, I'm an impostor). He's admitting his mistakes and acknowledging that he wasn't the loyal partner he claimed to be, making this word the emotional core of his plea for forgiveness.
In "El Farsante," Ozuna lays all his cards on the table. He's messed up, and he knows it. He openly calls himself a phony in love, admitting, "Yo sé que en el amor soy un farsante" (I know that in love I'm a faker). He even confesses to the specific lie he told: "Mentí diciéndote que era leal" (I lied telling you I was loyal). Now that his partner is gone, he's completely lost, describing his life as a "limbo desde que te fuiste de aquí" (limbo since you left here).
He doesn't want freedom or the single life; he just wants her back. His idea of a perfect future is surprisingly specific and materialistic: having a bank account with lots of zeros, making love every day, and spending all that money together. It's a bold and desperate plea from someone who realizes he had everything he wanted and threw it away. He swears he'll never fall in love again without her, hoping she still feels something for him too.