Sam nodded at her insistence that she knew him. He had to be careful here, he didn't want to overload her with information and do just as much damage as not telling her anything. "It's....complicated, but yes, you know both of us. We came here from the same reality."
Sam paused, it would be impossible to explain much more without some less than orthodox information. He wasn't sure how this was going to go, but he had to figure it would be better than not telling her. "You don't remember because.....your memories of us were wiped. Or altered is probably more accurate."