YOU SAID:
I thought you'd always be mine meaning in english
INTO JAPANESE
あなたはいつも私のものだと思っていた.
BACK INTO ENGLISH
I always thought you were mine
INTO JAPANESE
私はいつもあなたが私のものだと思っていました
BACK INTO ENGLISH
i always thought you were mine
INTO JAPANESE
私はいつもあなたが私のものだと思っていました
BACK INTO ENGLISH
i always thought you were mine
You've done this before, haven't you.