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に夢中なの

be crazy about

→ に
phrase Rare #27,402
be crazy about Follows the person or thing someone is absorbed in or enthusiastic about. The ending なの adds an explanatory or emphatic tone.
JA: 彼女は音楽に夢中なの。
EN: She’s crazy about music.

彼に夢中なの！

I'm crazy about him!

この人飛行船に夢中なの

This person is obsessed with airships.

— 魔女の宅急便 (1989)

あなたに夢中なの。

I'm crazy about you.

なんでそんなに彼に夢中なの？

Why are you so crazy about him?