Any recommendation where Ml treat Mc so bad and Mc choose 2nd in the end, or where Mc might die or suicide. That's it's so dark that she broken and Ml beg for her back.
Well, I know a novel where the FL chose the third ML..... It has comedy and things but the angst is quite okay imo. Aand yes, she was kinda betrayed by two of the MLs https://www.novelupdates.com/series/the-crazy-adventures-of-wu-gate/
I'm not sure if these would suit you but, feel free to check them out Get Rid of the Male God and Marry the Rich (MC had had enough of her boyfriend and married another man) Bai Fumei in the 70s (the ex-husband got reborn as well as the MC but she still chose the ML)