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How to deal with not being thanked for a gift
Find a quiet, private place to talk.
If you decide to confront the person you gave the gift to about their lack of thanks, do so face to face and in a private spot. You may choose a neutral spot, like a coffee shop or a park bench.
Or you may invite the person over for coffee or dinner at your home and have the talk then. Try to choose a setting where you can talk honestly and freely with the person.