Desconociendo comes from the verb desconocer, meaning to not know or to be unfamiliar with. In this context, it's used to express the painful process of two people becoming strangers to each other.
The lyrics say, "No me gustan nada y ahora parecemos nos desconociendo" (I don't like it at all and now we seem to be becoming strangers). It's a poignant word that captures the emotional distance growing between the couple, making it a powerful and relatable choice for a song about a fading relationship.
This song is a really relatable look at what happens when the honeymoon phase of a relationship ends. The singer remembers a time when their partner's eyes would "brillaban" [shine] and they couldn't stop laughing just at the thought of being together. But now? It's a completely different story.
They feel a huge distance, even when they're physically together. The kisses are cold, and they don't even like them anymore. It's like they're strangers! The singer keeps asking, "Dime cuando se acabó la luna de miel" [Tell me when the honeymoon ended?], because they just can't pinpoint when things changed so drastically. It's a pretty blunt and honest take on how love can sometimes fade.