Kim is a self-righteuos bitch
I just could not get over the scene where Mark was going through the pictures, and Kim stated pitching a fit.
Yes, I understand that her life before transition was a very hard time for her, but she seems to have absolutely no consideration that the person who she used to be was very important to Mark. Mark is not going to be able to make progress with his recovery after the accident if she doesn't let him explore that part of his past, which she was a huge part of.
Mark has a brother who he will never get to see again. it is almost like Kim killed Paul with her transition, and where this puts Paul out of his misery, there are still the others (Mark) who are left to mourn his metaphoric death.