The who becomes obvious the more you delve into it, but let's just say there is a collective of people with a vested interest in keeping society in a state easiest to control. They use various tactics to do so, from psyops like left vs right false dichotomies, boomers vs millennials vs zoomers, interracial conflict, and devolution from the tribal unit to the "nuclear family" unit, to very blatant manipulation of academia, media, news, and business to achieve faster and more devastating changes.
The partioning of relationships is their next target, to fully break "partners" whilst maintaining the few basic human needs at a really shallow level to prevent them being sought out as a whole (separate sex, love, loyalty, companionship, living arrangements, etc) . For example, one aspect is something as strong as "love" is being targetted, watered down to the point where you hear people say they "love" a latte, or they "love" a piece of clothing. It's to make it a lesser emotion, to remove the passion and strength behind what love was, thereby making it easier to divide people further. Couples don't exist in this new world being made, they're "hook ups", and "body counts", and "dating apps". They have no value or permanence or importance. And people can sense there's something wrong with it, it's just taking longer because they don't know what it once was and what it now is that's happening to them.
For a tangential analogy, I've lived long enough to see "black people" get referenced differently by society in such a way that it's clear it was done intentionally to mess with linguistics. It used to be "blacks", then "coloureds", then "Africans", then "black people", then "people of colour", and with each arbitrary step, the words used before are considered "offensive and outdated", despite their obvious looping. It's word games intentionally to mess with people and give them doubt in their own language, which (again) is an intentional part of the manipulation.