してたわ

was doing

→ 為る
phrase Uncommon #19,745
was doing A casual contraction of していた, with わ as a sentence-ending particle. The subject is usually understood from context.
JA: 昨日はずっと勉強してたわ。
EN: I was studying the whole time yesterday.

メキシコの結婚式に出席してたわ

I was attending a wedding in Mexico.

— ブレット・トレイン (2022)

思い違いしてたわ叔母さんの友達かと警察を呼ぶように言われたの

I was mistaken—I thought you were my aunt’s friend. I was told to call the police.

— マルホランド・ドライブ (2001)

あたし勘違いしてたわ

I misunderstood.

— 生きる (1952)

少しはしてたわ

I was doing a little, at least.

— 最強のふたり (2011)

公園で犬の散歩してたわよ。

I was walking the dog in the park.

彼、明らかに動揺してたわ。

He was clearly upset.

うっかりしてたわ

I wasn't paying attention.

— ニュー・シネマ・パラダイス (1988)

警察の人感心してたわよ若いのにって

The police officer was impressed, saying, “Especially considering how young you are.”

— Departures (2008)

あなた考え事をしてたわ

You were lost in thought.

— 惑星ソラリス (1972)

勘違いしてたわ。

I misunderstood.