Mulder and Scully putting each other above everyone and everything else™
I keep thinking about his reaction after she speaks. Like the thought really never occurred to him. All this time he thought he was the only would within his rights to have doubts, ever. Even after she’d proven her loyalty over and over. ‘The little spy’ right? And it never really crossed his mind that she ever worried he might ever betray her, too. The vulnerability playing field was equal, and he hadn’t stopped to consider that.