I was always suprised that Denna never calls him Dulator, because I think she was his first love. But who knows if she loves him... and if he refers to the person he loves first or who truly loves him first. And maybe Denna will call him Dulator laterxD.
Well, yeah I always assumed that Denna will call him the dulator but till now it's not happened. And I think there must be a reason for that. Either Patrick is trying to hide that Denna is his first lover(since Kvothe I guess had never admitted that he loves her) so may be she is not his first lover. I have doubts on Fela..since we have seen them in a kind of out of normal situations. So, may be that would provoke Sim to kill Kvothe and ultimately he becomes our Kingkiller. Just guessing..