@reu did you really actually read the manga? if she's really have been together until before Akutsu left to human world, Akutsu would've know her right away when they meet again in the hell... but it's not, Akutsu didn't even remember her at first...
and I believe the thot is the one in the middle panel from this page https://mangadex.org/chapter/871331/4, leaving him alone to suffers more...