YOU SAID:

I love my girlfriend so much and she means everything to me and i will never be able to express how much i care about her and how much she's given me

INTO JAPANESE

私は私のガールフレンドをとても愛しています、そして、彼女は私にすべてを意味します、そして、私は私が彼女をどれほど気にかけているかそして彼女が私に与えている量

BACK INTO ENGLISH

I love my girlfriend so much, and she means everything to me, and how much I care about her and the amount she is giving me

INTO JAPANESE

私は私のガールフレンドをとても愛しています、そして、彼女は私にすべてを意味します、そして、私が彼女をどれだけ気にかけているかと彼女が私に与えている量

BACK INTO ENGLISH

I love my girlfriend so much, and she means everything to me, and how much I care about her and the amount she is giving me