Lee keeps her face pressed to Michael's chest, stubbornly keeping her eyes closed as if there's any hope for her getting back to sleep. She's listening, though.
“Maybe you are both.” He certainly can't be neither, or else the last year or so of them humping each other would have to turn out to be some kind of really elaborate fever dream she had.
“I don't know, Michael. If you weren't with me, would you look at men? Or women?”
— not that it bothers Lee necessarily to think that Michael might ‘look at’ anyone else, she can't even conceive of the possibility of him ever cheating on her, but she's actually never seen him express interest in anyone else. People flirt with him, but he's never flirted back. Not that she's ever seen, anyway. He's never dated anyone before her, never kissed anyone else. How do you figure it out if you never try anything?