I haven't told him/her anything
I haven't told him anything.
Todavía no le he dicho nada a ella.
I haven't told her anything yet.
— Pixote, la ley del más débil (1980)
De los chinos que te fumas no le he dicho nada.
I haven't said anything to him about the Chinese cigarettes you smoke.
— Dolor y gloria (2019)
I haven't told him anything.