My T always walks with me to do the door and says goodbye and take care and stuff. I'd feel super weird if she suddenly didn't do this one day, and just went to her desk. I'm sorry your T is inconsistent with the way she says goodbye - or doesn't. I think she should just do one thing all the time, whether that's saying goodbye or not. My pdoc doesn't walk me to the door or anything, he just says bye and stays at his desk and says to leave the door open. I don't mind this, because it's consistent. But if my T were to sometimes say bye and sometimes not, I'd feel really bad and worried about the times she did not.