As she spoke, Barry realized that despite the resemblance, the woman in front of him was not Patty. He also remembered how there had previously been people who looked like Laurel Lance and Malcolm Merlyn on the island. Apparently there were a lot of duplicates of people from his world out there on other Earths.
He closed his eyes for a moment to calm himself and then opened them and smiled. "I'm sorry," he said. "You look like someone I knew at home. That does happen here sometimes. I'm Barry Allen. It's a pleasure to meet you, Georgina."
It was a bit of a white lie since having that face look back at him was like a stab through the heart.