Hi gmn0122, good to hear back from you, and great to hear that your wife has started treatment. That could be a real positive.
do you ever try to play peacemaker? Its difficult for me to sit and watch what appears to be an slow motion car crash playing out, when to me it feels like it can be resolved with a conversation and a hug.
That part in bold stood out to me. We have our own feelings to manage about what we see the pwBPD in our lives doing/saying. We can manage our feelings in healthier ways or in unhealthier ways.
Sometimes, our desire to intervene is coming from a drive to manage our uncomfortable feelings. Of course it's difficult to watch the car crash, as you aptly term the situation.
Stepping in to try to manage/massage things is a way that we can sometimes escape our feelings instead of managing them appropriately. Sometimes it shows up as
Karpman drama triangle dynamics -- stepping in feels familiar, and we fall into an unhealthy (but less uncomfortable) role.
Anything in that link stand out to you, or seem like it might apply in your situation?