Hi and welcome
Going through big life changes like moving to another country can be stressful when living with someone with BPD. Having a routine and no surprises seems to help with their emotions.
How are you taking care of yourself? Do you take time away to relax or spend time with friends?
What boundaries do you have to protect yourself? When there's conflict, how do you handle it?
There's good info in the Tips menu at the top of the page.