He'd never empathized with Rachel more than he did in those moments, imagining what it would be like to be innocently eating lunch with a person who had been acting for all the world as though he liked you, who had given you no hint that anything was bothering him at all, when suddenly, out of nowhere, wham, it turned out you were completely wrong about him, and that everything he'd been telling you was a lie.
For the first time, Ted imagined fucking Anna the way he (almost) fucked Rachel: cruelly, without concern for her comfort, fully acknowledging that as much as he loved her, he hated her, too.
Ted was wildly uncomfortable. He wasn't quite sure who Rachel was on a date with, but it didn't seem to be him. He'd contributed nothing to the outing; as far as he could tell, she could have brought an inflatable doll with her to the movie and had an equally good time.