I was reading that this can go away if life gets better so if life get better for a pwBPD does it go away with time?
This is a good question.
There are 2 things at play in this question - BPD as an illness and the maladaptive coping mechanisms.
BPD will not go away over time. However, stress is a major factor on whether the maladaptive coping mechanisms are triggered.
The way I think of it - BPD is the fact that the person is highly emotional in responses when triggered. Anything can be a trigger.
It is the responses that were such chaos for my personal life. Things such as projection, gaslighting, drinking, affairs, cutting, etc - these maladaptive coping mechanisms will be there until effective treatment is sought. DBT doesn't tend to say these feeling are bad, it gives tools to help effectively cope with the feelings.