Responses

a lot of details are different but maybe this? the ml's ex is the one who has cancer and he dies, but then ml also moves on with the mc
https://www.mangago.zone/read-manga/incidentally_living_together/

it sounds like this specific chapter:
https://www.mangago.zone/read-manga/incidentally_living_together/uu/iur_chapter-40/pg-63/
It goes like this:
(i might be getting ML and MC mixed up, not sure tho)
- ML and MC lived together
-ML was diagnosed with cancer/terminal Illness
-ML died and the story is mostly a telling of how sad MC is and how he's overcoming the grief
It should be at the very least shounen ai, though i dont know if there was nsfw or anythig like that
Memorable scenes or situations i remember reading about:
- the atmosphere and the coloring was mostly blue
- ML was in a Weelchair in some scenes, and had lost his hair at some point
- MC became an alcoholic, one of his friends came over to help him but MC threw a tamper tantrum?
- MC read a letter that ML left and cried, in his bed i think
i've read this a long time ago but never saved it as read/want to read unfortunately
I don't think it's 10 years i've loved you the most
any Help will be appreciated, i just wantedt to reread this but devastatingly had to realise that i forgot the name