Just checking in and catching up .. I have been pretty busy as I am about to move here at the end of the week.
Just to chime in a bit ... yeah bro, no V-day gift but its not out of punishment and more out of just the awkwardness it would carry with it for both of you. I also suspect OM2 dumped her so she is probably hiding a bit of sadness that the euphoric relationship is gone, mine did the same (Only to later reconnect with him which brought on my BD and I left)
I have a buddy who still has his MLCr at home, much like in your case its a live in roommate and the family on the surface looks together as they do events but she will pick and choose when she wants to attend and he has opt'd just to place her in the extended family zone as he goes about his life the way he feels fit. Might not be a bad guideline for you to apply here and see if you can not outlast the crisis if that's what you are aiming for.