I'm so secretive that when someone asks me, Hey, can you keep a secret? I say That's none of your business.
Your feelings are none of your business.
What others think about you is none of your business.
I'm pretty open book, I'm also the kind of person that will say, 'That's none of your business,' too.
It's none of your business what people say about you.
After you have finished a piece of work, the work is then none of your business. Go on and do something else.
Your reputation is none of your business.