くれなかったの

why didn't you ... for me?

→ 呉れる
phrase Rare #20,791
why didn't you ... for me? Used at the end of an informal question to ask why someone did not do something for the speaker. It often expresses mild reproach or disappointment.
JA: どうして手伝ってくれなかったの?
EN: Why didn't you help me?

どうして今日はうちに寄ってくれなかったの

Why didn’t you stop by my place today?

なんでメール返してくれなかったの

Why didn't you reply to my email?

どうして起こしてくれなかったの

Why didn’t you wake me up?

なぜ連れて行ってくれなかったの

Why didn't you take me with you?

— 惑星ソラリス (1972)

どうして昨日寄ってくれなかったの

Why didn’t you stop by yesterday?

小さい頃うちの親テレビを見せてくれなかったの

When I was little, my parents wouldn't let me watch TV.

来る前になぜ電話をかけてくれなかったの

Why didn’t you call me before you came?

なぜ話してくれなかったの

Why didn't you tell me?

— レベッカ (1940)

何で昨日の夜電話してくれなかったの

Why didn't you call me last night?