YOU SAID:

I am going to break up with you tomorrow

INTO JAPANESE

私は明日あなたと別れるつもり

BACK INTO ENGLISH

I'm going to break up with you tomorrow

INTO JAPANESE

私は明日あなたと別れるつもりです

BACK INTO ENGLISH

I will break up with you tomorrow

INTO JAPANESE

私は明日あなたと別れるでしょう

BACK INTO ENGLISH

I will break up with you tomorrow