あなたって、本当に

you really...

→ 貴方
phrase Rare #38,716
you really... って marks あなた as the topic, often giving the phrase an affectionate, surprised, or emphatic tone.
JA: あなたって、本当に面白いね。
EN: You’re really interesting.

あなたって、本当にやるつもりなの?

Are you really planning to do it?

あなたって、本当に幸せそうね。

You really do look happy.

あなたって、本当に優しい人ね。

You really are such a kind person.

あなたって、本当に変わった人ね。

You really are a strange person.