YOU SAID:

So to my ex bestfriend I thought I knew to then end sorry I know things aren't going as we planned we really messed up this time

INTO JAPANESE

私の元親友に、私は本当に終わってしまったことを知っていたと思った

BACK INTO ENGLISH

I thought my ex-best friend knew I was really over

INTO JAPANESE

元親友が本当に終わったと知っていたと思った

BACK INTO ENGLISH

I thought I knew my ex-friend was really over

INTO JAPANESE

元友達が本当に終わったと思った

BACK INTO ENGLISH

I thought my old friend was really over

INTO JAPANESE

昔の友達は本当に終わったと思った

BACK INTO ENGLISH

I thought my old friend was really over