No, I suppose there is no harm in it. You know I trust you, Helena, but I would-- how much would you tell her?
[He doesn't quite believe that Ella fully trusts him, since he isn't of the mindset that anyone can trust someone they dislike. It's the details about his own fortress that he would prefer to be kept secret, since his thoughts and emotions aren't something he shares with many - and if he had a choice, Ella wouldn't be someone he would share them with.]