YOU SAID:
i love my girlfriend so much
INTO JAPANESE
私は私のガールフレンドが大好きです
BACK INTO ENGLISH
I love my girlfriend
INTO JAPANESE
彼女が大好きです
BACK INTO ENGLISH
I love her
INTO JAPANESE
あの子を愛してる
BACK INTO ENGLISH
I love her.
INTO JAPANESE
あの子を愛してる
BACK INTO ENGLISH
I love her.
That didn't even make that much sense in English.