YOU SAID:
i love my girlfrieend
INTO JAPANESE
私は私のガールフレンドを愛しています
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
私は彼女を愛している
BACK INTO ENGLISH
i love her
That didn't even make that much sense in English.