YOU SAID:
your not that good my guy
INTO JAPANESE
あなたはそれほど良くないです、私の彼
BACK INTO ENGLISH
you're not so good my boyfriend
INTO JAPANESE
あなたはあまり良くありません、私のボーイフレンド
BACK INTO ENGLISH
you're not so good my boyfriend
That didn't even make that much sense in English.