I’m thinking about moving right now for the same reason. My ex knows where I live and if my PTSD flares up then I don’t feel safe in the house. I moved a (detail removed by moderator) roommate in to feel safer and to try and (detail removed by moderator) again, but it backfired because (detail removed by moderator); I then wake up in a panic and can’t go back to sleep for a long time. I don’t know if it would be the same if I moved or not – I’m not sure whether PTSD is attached to the place or whether it will attach itself to something else.
I wonder whether you have done any work for PTSD? If not, then that might help with the flashbacks. Maybe you could see how you feel in other spaces, too, and that would help you figure out whether or not to move.