If the person is butting into the conversation between you and someone (whether one on one, or your group), Politely tell this person, 'This is a private conversation, I do not mean to be rude, but if you will excuse us...' However, personal conversations really should be outside of working hours...if it is work related, and this busybody has nothing to do with the issue being discussed, then I'd tell him that you have the situation well in hand, but thank you for his input, and if you need him, that you will let him know. If he doesn't get the hint, be blunt. It is none of your business, and we really tire of you butting in where you are not needed, wanted, invited and we'd appreciate it if you would not continue to get involved in these issues. JMHO.
Well I'm gonna add my 2 cents. When someone buts into my conversation I politely say excuse me, this doesn't involve you, we would like some privacy.(If they get angry its their problem, I don't make it mine.) If someone asks me something I don't want to reveal, I politely say, I'd rather not talk about that and change the subject. I was always running into problems like this being that I had no boundaries. I attracted others who didn't also, as I developed mine, I taught people how to treat me. But this is a pattern for most so it will take consistency to change the pattern but it does get easier.
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