cry over spilled milk
To be upset over something that cannot be fixed, often something minor. Please calm down, you're just crying over spilled milk. We already submitted the report, so we can't fix it now. A: "Why is Hannah so upset?" B: "Oh, she's just crying over spilled milk. She just ripped her stockings—she'll be fine." We were pretty disappointed to have lost the championship game, but there's no use crying over spilled milk. We just have to train harder for next season!
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