Sube y baja literally translates to "up and down" and is also the Spanish word for a "seesaw." It's an engaging phrase that paints a vivid picture.
In the song, Luis Figueroa uses it to describe the unstable and unpredictable nature of a relationship: "Estamos en un sube y baja" (We are on a seesaw / We are in an up and down situation). This metaphor perfectly captures the emotional rollercoaster the singer is experiencing, making it a memorable and relatable expression.
Luis Figueroa builds this whole salsa track around a faulty light switch. "Como luz que se apaga y se enciende" ("Like a light that turns off and on") is how he describes someone who turns up, takes what she wants and disappears again, and the chorus repeats it until the image starts to sound like a diagnosis rather than a complaint. The verses keep the receipts. He handed over the moon, "Después que te brinde la luna" ("After I gave you the moon"), and got filed away as "Como una noche más" ("Like just another night").
The second half is where it gets sharper, because he stops protesting and starts listing the contradictions one line at a time: "Me hieres y me curas" ("You hurt me and you heal me"), "Me quitas y me das" ("You take from me and you give to me"), "Te vistes y te desnudas" ("You dress and undress"). He knows exactly what is happening to him. "Entras y sales cuando tú quieres" ("You come in and out whenever you want") is as close as he gets to an accusation, and he sings it over a brass arrangement that sounds like it is having a much better night than he is.