Amargándonos comes from the verb amargar, meaning "to embitter" or "to make bitter." The -nos ending indicates a reflexive action, meaning "making ourselves bitter."
In the context of the song, it's used to describe the act of prolonging a bad relationship and causing mutual bitterness. The line "Para qué continuar amargándonos más" (Why continue making ourselves more bitter) perfectly captures the sentiment of a relationship that has run its course and is only causing pain to both parties.
Have you ever been in a relationship where you just know it's over? That's exactly what La Zenda Norteña and La Maquinaria Norteña are singing about in "La Mejor Opción." They get straight to the point, telling us that "El amor se nos fue, se perdió" [Love left us, it got lost] and the passion is totally gone. It's a blunt but honest look at realizing that sometimes, ending things really is the best choice, even if it hurts.
The song uses some really vivid images to describe this fading love. They say it "Se fue el amor, como el agua entre las manos" [Love left, like water through your hands], which is such a relatable feeling of something slipping away. And my favorite line is when they compare their love to a plant that "se secó porque nunca se regó" [dried up because it was never watered]. It's a clear reminder that love needs care from both sides, and they admit, "La culpa no es solo mía, Es culpa de los dos" [The fault isn't just mine, It's both our fault]. It's a powerful song about recognizing when it's time to let go for good.