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なんて、知らなかった

I didn't know that …

→ なんて
phrase Rare #45,309
I didn't know that … なんて adds surprise or emphasis to the fact being mentioned.
JA: 彼が料理できるなんて、知らなかった。
EN: I didn't know he could cook.

トムがまだここで働いてるなんて、知らなかったわ。

I didn't know Tom still worked here.

彼氏がいるなんて、知らなかったわ。

I had no idea you had a boyfriend.

病気だったなんて、知らなかったな。

I had no idea you were sick.