Hi Tattered Heart,
Welcome and hello

The holidays are stressful, that's for sure, and a new house on top of things. I think many of us with BPD loved ones experience the kind of devolution you talk about this time of year. And like you point out, people with BPD don't handle stress very well, and moving is stressful.
What are some of the behaviors that surface when he is going through a cycle? How do you respond? What are the boundaries you feel slipping?
Any kids?
Glad you found the site, there is a lot of support here and people seeking solutions

LnL