YOU SAID:
My best friend had a party and didn't invite me
INTO JAPANESE
私の親友はパーティーを開きましたが、私を招待しませんでした
BACK INTO ENGLISH
my best friend threw a party but didn't invite me
INTO JAPANESE
私の親友はパーティーを開きましたが、私を招待しませんでした
BACK INTO ENGLISH
my best friend threw a party but didn't invite me
You've done this before, haven't you.