LO, glad to hear from you. I agree about the OW's xh email. It's interesting to think about the situation. You and him are not enemy, also not friends. Yet both of your lives are so related together in this situation.
Your STBX is just so selfish in staying in the house. unblievable. Don't think about the holidays so much if you are not in the mood. If you are, go enjoy it. If not, consider it one year that you are taking a rest from all the activities. A laid back vacation. My H is shopping for wine at this very minute. So go have a glass (a virtual one from me), and relax with some good music with your DD. Personally, I can't wait to do that after my midterm :-)