Mind (one's) own business spoken language verb phrase
To take care of their affairs and not interfere in others'.
Can you just mind your own business? I can take care of my things.
Stop bothering me, mind your own business.
Don't ask me about the things between Jane and me anymore. Mind your own business.
Jane! I would appreciate that you leave me alone and mind your own business.
It is mostly used in the present tense.
If you fall for someone's trick the first time then they are at fault.
Are you going to mess with me again? Fool me once, shame on you; fool me twice, shame on me.