YOU SAID:

I do not know if I would want to be his girlfriend

INTO JAPANESE

私は彼のガールフレンドになりたいかどうかわからない

BACK INTO ENGLISH

I do not know if I would like to be his girlfriend

INTO JAPANESE

私は彼のガールフレンドになりたいのか分からない

BACK INTO ENGLISH

I do not know whether he wants to be his girlfriend

INTO JAPANESE

彼が彼のガールフレンドになりたいかどうかわからない

BACK INTO ENGLISH

I do not know if he wants to be his girlfriend

INTO JAPANESE

彼が彼のガールフレンドになりたいかどうかわからない

BACK INTO ENGLISH

I do not know if he wants to be his girlfriend