[Erik shifts back in his seat a little, not really expecting the question. He'd had a sense of wrongness about Charles's reaction then. That much had been clear immediately. But he had been drowning in his own feelings then.]

...I knew it hurt you. And shock. [He pauses, collecting his thoughts.] You said you know me so well, but I don't think you expected that. ["I was afraid that everything had changed."] It was another change.