When someone sticks their nose in your business today, you will have to tell them to but out.
You are going to feel that someone is sticking their nose in where it's not wanted today. This will irritate you as you feel the issue in hand is none of this persons business. This person may mean well, but you need to tell them to but out. Do this calmly and with consideration for their feelings, but make it clear that their interference is not welcome.