his/her secret
She told me her secret.
Estábamos todos atentos cuando empezó a contarnos su secreto.
We were all listening intently when he started telling us his secret.
Mi padre, esa bestia vieja, no me dijo su secreto.
My father, that old beast, didn't tell me his secret.
— Andrei Rublev (1966)
Tom no le dijo su secreto a Mary.
Tom didn't tell Mary his secret.
Tom me contó su secreto.
Tom told me his secret.
I know their secret.
Él contó a sus amigos su secreto.
He told his friends his secret.