EX HELP! .. plz?

My ex is a total jerk.. he has a new girlfriend and he is being rele mean and rude to me.hes like ur a bad kisser ..Soso IS way better!! u need to talk lessons from her. he told every1 that right in front of me .. the only thing is we are rele good freinds BEST FREINDS ..hes just can sumtimes be mean im over him now i dont like him and He DOES not like me back .. we have both moved on hes a lier and hurt me horrible we lasted 8 months its a shocker we are still best freinds like we were before we went out......should i tell him to back off or what?