I believed him/her
I believed him.
And I believed him, naturally.
— Investigación sobre un ciudadano libre de toda sospecha (1970)
No le creí e hice unas llamadas.
I didn't believe him and made some calls.
— Mulholland Drive (2001)
Jamás le creí ni una sola palabra.
I never believed a single word he said.
No le creí capaz de hacer cumplidos.
I didn’t think he was capable of giving compliments.
— Por un puñado de dólares (1964)
At first, I didn't believe him.