Actually he isn't the real Rory. All of the Romans (including Rory) were created from Amy's memories. Rory the Roman is just a distant memory. Its just how Amy remembers him, so that's how Roman Rory is.
Tears run Down my face as I walk in the cold snow. 'I need to call a cab'. I came across a blue box up where it says Police PUBLIC CALL Box. 'That will do' I open the door and walk in." I hear a man say.