The woman in this video, with borderline, talks about the process of idealisation and devalution and in this context says:
"And all over night, seemingly, you are the bad guy and you can disconnect from them.
You are unable to see that you should offer someone closure because you don't see that you should."
The second sentence starts just after 6:00 the first one ends just before that.
As I don't have borderline myself I ...