"I... don't know," Theodore replied, and really, there were many reasons he shouldn't have been telling her all of these things. He knew that he trusted Demelza and could partly rationalize the conversation in his head, but he couldn't really explain why he was initiating this awkward talk. Perhaps it was nice to get things off his chest? Demelza was taking it all extremely well. In fact, Theodore was positive that if anyone had fallen in love with him that week and actually expressed it, he wouldn't have easily gotten over it. It would have creeped him out. Demelza was taking it all in stride, and he was very relieved.
"I mean, all of the girls know anyway. You were going to find out from someone," He told her, going with his earlier logic and shrugging off the question. He was very worried that this conversation might get even more serious and awkward than it already was. He wasn't really sure how they had gotten from him pranking her to this, but he was fairly certain that it had been his fault either way. He was mentally noting that Demelza seemed to like serious conversations. Perhaps he would use that tactic the next time he pissed her off...
Ah, and there was the answer. Theodore had brought all of this up to make Demelza feel better. Well! He wasn't about to admit to that. Not even a chance. "I've always been told that girls talk a lot to each other."