Betty's face, if anything, grows only more blank before she seems to remember herself and smiles. It's a warm and reassuring smile, but it's also clearly false; she's forgotten those didn't work on Ruth. Haven't in a while, or possibly ever. Excruciatingly cautious, "Which part did you think was just you?"

In trying not to let her concerns or feelings influence her - friend? girlfriend? lab partner?? - most of Betty's physical cues shut down. She's always removed herself in this way. She thought they'd talked about this! Sure, in the abstract, the hypothetical, about people who were very much not themselves, but it was only nominally in the abstract and the hypothetical and the, the not themselves. Right?

Did you not know about the lesbians, because, gorgeous, I'm pretty damn sure...