Out of sight , out of mind

[Yoke]

I have been thinking a lot of this "out of sight , out of mind" when a BPD devaluate you. I understand that you got to close to them and they also felt engulfed, but is it also that if they do this out of sight-thing , is it also a way for them to protect themselves from not thinking of you because it hurts  and makes it harder for them to move foward and not make the "misstake" going back to you?