Hynacith's feed

Pls recommend me some angst manhwa/manhua/manga where the lover/spouse mistreats the other partner, and when the other partner leaves/has illness/dies, the lover/spouse regrets it. The same troupe as "10 years where I love you the most", must preferable if the other partner leaves with another person lol, but if they did not itz still fine.
Any genres are fine! Whether it'll be bl/gl/straight I do not care, I just wanna read some angst and cry myself to sleep(づ￣ ³￣)づ