Is there an expression to use when we want to say that someone does you a favor, but they keep talking about it or reminding you of it too much in a way that annoys you?
Learn English – Remind someone of your favor too much
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Best Answer
harp on, according to the Free Dictionary
In your example: "I wish X would stop harping on the fact he did me a favor when he drove me to work for a week when my car was in the shop."
The Free Dictionary gives the origin of the phrase:
Harp on is probably more often associated with complaining incessantly, but it need not mean complaining.