YOU SAID:
i think im in love with my best friends boyfriend
INTO JAPANESE
私は親友の彼氏に恋をしていると思う
BACK INTO ENGLISH
I think I'm in love with my best friend's boyfriend.
INTO JAPANESE
親友のボーイフレンドに恋をしていると思う。
BACK INTO ENGLISH
I think I'm in love with my best friend's boyfriend.
Well done, yes, well done!