is only ...'s concern
It's just my business.
La vie sexuelle d'un jeune homme ne regarde que lui, et c'est tant mieux.
A young man's sex life is no one else's business, and that's just as well.
— Parasite (2019)
Ne regarde que vers l'avant, tu continueras de crier.
Only look straight ahead; you'll keep screaming.
— Demon Slayer : Kimetsu no Yaiba - Le film : Le train de l'Infini (2020)
Et ce que j'ai à te dire, ça ne regarde que nous deux.
And what I have to tell you is between the two of us.
— Manon des sources (1986)
Ce qui se passe entre moi et ma femme ne regarde que moi.
What happens between me and my wife is my own business.
— Chute libre (1993)