Oof... that's part of the NTR route... it's pretty tragic... I did it out of a sense of completionism but I kinda wish I hadnt...
Well spoiler warning obviously
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Essentially, she ends up getting kidnapped and strung out on drugs by her manager, gets gangbanged by him and his friends who turn her into a sex slave, up until he mentions he's going to use her to do the same to her sister, which snaps her out of her drug induce stupor, and drives her into a rage where she fucking stabs one guy in the eye with a drug needle he was trying to use on her, gets her ass beaten by the black hitman guy and then pulls some crazy home alone stuff on the him before putting him down (with his own gun I think) and then she completely slaughters the manager with a butcher knife from the kitchen, pretty sure she castrates him too, before you finally show up to find her covered in blood with the house on fire. You compress all the corpses and take her home. Pretty sure she never speaks about it again. I think you actually play as her in the home alone part but I don't remember. She's a fucking badass tho.
from what I have read it's for the same reason people like femdom, humiliation , bdsm and so on it have to do weakness and not having control over your self and this means that NTR to the ultimate symbol of weakness seeing your wife/gf taken by someone else
Personally I like NTR if I'm the one doing it to someone I hate, it feels like the ultimate power move