@Noctua of course she know nothing about him. Because every time they are together, he only talks about the princess. How can you know someone when the other person don't want to talk to you or tell you what they want. He always talk about the princess so the FL of course will think that he want to be with the princess. Like she's the one that write and send him letters, invite him to go on dates, make conversation about things
But what she hear in return is all about the princess