YOU SAID:
I can't believe you'd buy me an iPhone 13! Thanks so much!
INTO JAPANESE
iPhone 13を買ってもらえるなんて信じられない!本当にありがとう!
BACK INTO ENGLISH
I can't believe you bought me an iPhone 13! thanks so much!
INTO JAPANESE
あなたが私にiPhone 13を買ってくれたなんて信じられません!本当にありがとう!
BACK INTO ENGLISH
I can't believe you bought me an iPhone 13! thanks so much!
That didn't even make that much sense in English.