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したのに

even though [someone] did

→ 為る
phrase Uncommon #7,901
even though [someone] did A sentence-ending expression combining した (did) with のに (even though/although). It often expresses disappointment, frustration, or a result contrary to expectations. The subject and the action may be understood from context.
JA: 一生懸命勉強したのに、試験に落ちた。
EN: Even though I studied hard, I failed the exam.

せっかく用意したのに

Even though I went to all the trouble of preparing it.

— 紅の豚 (1992)

ここまで計画したのに、今更やめるって言わないでよ。

We've planned all this out, so don't tell me you're quitting now.

忠告したのに私の言うことを聞かないからだ

Because you wouldn't listen to me even though I warned you.

— ほんとうのピノッキオ (2019)

さんざん世話をしたのに何のあいさつもない。

After all the help I gave them, they didn't even thank me.

あんなにヒットしたのに

Even though it was such a big hit.

— レザボア・ドッグス (1992)

話すのを止めるようにお願いしたのに、あの人たち、ずっと話してたわ。

Even though I asked them to stop talking, they just kept talking.

彼女が私の友達だったら、私はそうしないようにと彼女に忠告したのに。

If she had been my friend, I would have advised her not to do that.

トムは一生懸命に勉強したのに試験に落ちた。

Tom studied hard, but he failed the exam.