keep your own counsel
US /kiːp jʊər oʊn ˈkaʊn.səl/
UK /kiːp jʊər oʊn ˈkaʊn.səl/

1.
garder son propre conseil, garder le secret
to keep one's thoughts, plans, or intentions private; to not share one's opinions or decisions with others
:
•
It's often wise to keep your own counsel in sensitive negotiations.
Il est souvent sage de garder son propre conseil lors de négociations délicates.
•
She decided to keep her own counsel about her future plans.
Elle a décidé de garder son propre conseil concernant ses projets futurs.