I felt on the verge of talking to her about things I hadn't talked about before. I'd written about them. Sometimes I write to keep from going crazy There's a world of things I don't feel free to talk to anyone about.
Right here, we see a step in her character development. It shows that she hasn't really opened up to anyone else before and that she is contemplating whether to open up or not. The only person shes been honest with really is only herself.