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Something someone wants to know, but they don't need to know. It's not their problem, and they're not welcome in the mess.
Why do you care what my ex said about you? It's not your business, and you're not my ex.
Why are you asking about my kid's report card? You're not their parent, and you're not getting a raise.
Why do you want to know my password? You're not my friend, and you're not getting any of my snacks.