'RHOA' Cynthia Bailey Separated from Peter Thomas ... Living Miles Apart

Cynthia Bailey and Peter Thomas' marriage has been torn apart by 'RHOA' ... at least that's how Peter sees it, now that he's moved out of their Atlanta home.

TMZ has learned the 'Real Housewives of Atlanta' stars are now living in separate states -- CB's in their ATL home, while Peter's in their Charlotte crib.

We're told it's been this way for months, because Peter decided he doesn't want to do 'Housewives' anymore. He thinks the show drama -- which has focused on their marital issues -- is making it too hard to patch things up when cameras are off.

Despite promos for the upcoming reunion that mention cheating rumors ... we're told Cynthia doesn't think Peter's stepping out on her. No one's filed separation or divorce docs yet, but we're told it's just a matter of time.