YOU SAID:
Happy Birthday, you're the best boyfriend ever.
INTO JAPANESE
お誕生日おめでとう、あなたは今まで最高の彼氏です。
BACK INTO ENGLISH
Congratulations on your birthday, you are the best boyfriend ever.
INTO JAPANESE
お誕生日おめでとう、あなたは今まで最高の彼氏。
BACK INTO ENGLISH
Happy birthday, you got the best boyfriend ever.
INTO JAPANESE
お誕生日おめでとう、あなたは今まで最高の彼氏を持って。
BACK INTO ENGLISH
Happy birthday, you got the best boyfriend ever.
That didn't even make that much sense in English.