The apology you're still sitting on

“You and your partner were in the car on the way to something and you made a comment about how they were driving — not a fight, just a sharp little remark that came out more critical than you meant it. They didn't say anything, just adjusted their grip on the wheel and went quiet. You arrived, did the thing, came home. Now you're both getting ready for bed and the comment is still sitting there between you, unacknowledged.”