le vs la?

Hola L. B.

Great question! In this sentence, "le" is correct because it's functioning as an indirect object pronoun. The verb llenar here is used in a figurative sense—“to fulfill” or “to satisfy”—and when we talk about something “not fulfilling someone”, we use the indirect object.

So, “no le llena” means “it doesn’t fulfill him/her”. Using "la" would make it a direct object, which doesn’t fit this construction.

It’s similar to saying: “That job doesn’t satisfy her” → “Ese trabajo no le satisface.”

Hope that helps clarify it!

Un saludo

Silvia