I started writing a new story recently and i am having some problems with my main character development. The idea is that the character has three layers of character, first the mask he projects socially that is completely fake but convincing, second the face he only shows his sister and his closest friend and third his true characterthat he shows noone at first and only one or two people in the end. My problem is that while the first layer comes off easily through everyday interactions and the second also somewhat forms quite good, the third layer i can't show. How can i show a face that he doesn't show to anyone and he doesn't incorporate in his everyday behaviour either? I thought maybe i could show it through his introspection when he is alone at some point but what i want is for it to build up for the reader slowly, not appear out of the blue. Any help is welcome.