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を待ってたのに

even though [someone] was waiting for

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phrase Rare #40,230
even though [someone] was waiting for A colloquial contraction of を待っていたのに. The subject is often omitted and understood from context; のに expresses contrast, disappointment, or an unexpected result.
JA: 駅で君を待ってたのに、来なかったね。
EN: Even though I was waiting for you at the station, you didn't come.

私は家も掃除して、ご馳走も作って二人を待ってたのに声もかけてくれないなんて

I even cleaned the house and prepared a feast, waiting for you two, and you didn’t even say hello to me.

— 箪笥＜たんす＞ (2003)

僕たちトムを待ってたのに、トム来なかったんだ。

We were waiting for Tom, but he never showed up.

トムとメアリーを待ってたのに、あの二人来なかったんだ。

I was waiting for Tom and Mary, but they never showed up.

私達さ、トムを待ってたのに来なかったのよ。

We were waiting for Tom, but he never showed up.