I think many narcissists intentionally do unpleasant things to their significant others in order to elicit their emotional responses which, in turn, confirms said narcissists’ existence.
If you watch narcissists who are eager and amped up to catch a glimpse of the significant others’ anguish, they are transfixed on what to them apparently is the equivalent of a tasty life sustaining snack such as….…………….
a SO’s tears of anguish
a SO’s sigh of desperation
a SO’s wincing in pain due to his or her emotional upset
An alert significant other (SO) will notice that as he or she is emoting, the narcissist relationship partner is apt to be intensely watching his or her SO’s facial expressions and body language in the same manner a crocodile watches a wounded wildebeest as it crosses a river.
I think many (not necessarily all) narcissist relationship partners get an emotional lift from manipulating their significant others into becoming upset as they feel it confirms their superiority, power, and control over their significant others which, in turn, confirms said narcissists in fact matter/exist.
Even if the narcissist relationship partners can not literally see visual representations of their significant others’ emotional angst, they will derive pleasure thinking about how due to their actions their significant others were rendered sobbing, sighing with dread and/or writhing in emotional pain.