Pataletas translates to "tantrums" or "fits of pique." It's a vivid and somewhat informal word that paints a clear picture of childish or dramatic outbursts.
In the song, the singer uses it to describe his partner's "continuas pataletas" (continuous tantrums), highlighting his frustration with her emotional immaturity and dramatic behavior. It's an interesting word because it's not as common as other terms for arguments, and it perfectly captures the exasperation of dealing with someone who acts like a child.
Jessi Uribe brings us a song about a relationship on the brink, where one person is constantly threatening to leave but never actually does. The singer is fed up, saying, "Me dices que te vas, que te vas y no te has ido" [You tell me you're leaving, you're leaving and you haven't left]. He's tired of the empty threats and the drama, especially the "celos enfermizos" [sickly jealousy] and "continuas pataletas" [constant tantrums].
He suggests that maybe his partner is scared to leave, perhaps because they fear being forgotten or what their friends and mother-in-law might say. But the singer has reached his limit. He's been putting up with it "por el amor de mis hijos" [for the love of my children], but warns that "algún día la copa se reboza y no hay de vuelta" [someday the cup overflows and there's no turning back]. He gives a blunt warning: if she crosses that door, "Cuando quieras volver ya tendrá nuevo candado" [When you want to come back, it will already have a new lock].