Hi
Those of you that are caring for people with BDP, the following is what I have learnt through my experience with my partner.
Once it has been diagnosed there is DBT therapy available - contact your local mental health hospital. There is normally a BDP department.
The course lasts a year and they must attend, there is also information for carers, family - it’s called family connections in my area.
You will have to be persistent to get this help.
They are selective about who they take on.
There is a Facebook group also.
The journey isn’t easy, it gets better in the great scheme of things but in my experience it doesn’t go away.
PM me if you any help.