i dont know if this idea is helpful or not but could you open a google doc and give her access you can write down all of your confessions and she doesnt have to read them unless she wants to  i have borderline personality i get the intrusive thoughts occasionally i tell my boyfriend about them but he doesnt really understand mental illness and cant grasp the fact i have minimal control over these thoughts your girlfriend is an angel try not to block her out of too much let her help you when she can