definitely https://www.mangago.me/read-manga/red_mansion/ they were match made in hell
https://www.mangago.me/read-manga/unchanged_man/ codependency
https://www.mangago.me/read-manga/warehouse/ this one's actually sort of victim x abuser but it's really interesting i highly recommend
https://www.mangago.me/read-manga/black_mirror/
can't forget the og of ogs https://www.mangago.me/read-manga/killing_stalking/

Toxic x toxic. Codependency. Maybe a dash of Stockholm syndrome and yanderism? NOT abuser x victim. I want to read that shit and think "oh these assholes deserve each other".