I could only find a few but hope these are alright ^_^
https://www.mangago.zone/read-manga/cosmic_boy/
https://www.mangago.zone/read-manga/a_shoulder_to_cry_on/
https://www.mangago.zone/read-manga/the_third_ending/
To a certain extent people wouldn't say they are toxic but i think you would get my point after the first few chapters but it doesn't end in a bad way they will fall inlove
The broken ring:This marriage will fail anyway
https://www.mangago.zone/read-manga/escape_into_oblivion/
a little angsty but definitely toxic
Yet you love a guy like him (novel: completed)
like i want toxic character to be begging on his knees sobbing for the other character to keep loving them or something lmao
(if you don’t know what a chasing arc is , it’s basically where character A starts trying to pursue character B after rejecting character B and realizing how much character B has done for them or whatever)