Keep your nose out of something
Definition 1 of 1
Pro Tip 1/3Subtle Warning
Implies that getting involved could cause trouble or be unwelcome. 
When she started asking about my finances, I told her to keep her nose out of it.
Pro Tip 2/3Emphasizing Discretion
Highlights the importance of respecting privacy. 
He’s very private about his art, so we keep our noses out of his studio.
Pro Tip 3/3Indirect Request
Used to tell someone indirectly to stop meddling. 
I can handle my issues myself, please keep your nose out of them.