Typically, the "cure" for burnout is to change things up... .
... . change your job, your exercise routine, your schedule... .
Hence we see BPD's QUICKLY "change out" their relationships.
Get a new one.
And get it fast.
And so they avoid the burnout... .
I want to stress this is very true. When things calm down (let's face it, we all justified behavior on some circumstance or another) this is when we tend to see the worst of the maladaptive coping. If there is chaos, having to deal with real feelings is not the focus. So, why not keep chaos going?
A relationship tends to last when the non is just as OK with chaos as the pwBPD... . nons get burned out, pwBPD who are not in treatment tend to thrive in change. They may say they don't, but look at their actions.