a really devastating dissection of grief: https://www.mangago.zone/read-manga/happy_birthday_1/
havent read this but ive had it recd so lol: https://www.mangago.zone/read-manga/back_in_time_to_you/
Haruka Tooki Ie and Spring Snow got me really bad.
Here's my cry baby list.
https://www.mangago.zone/home/mangalist/2628518/?filter=&page=1
https://www.mangago.zone/read-manga/incidentally_living_together/ I cried and cried so hard till I couldn't breathe
"Into the Rose Garden"
This one just shattered my heart and i'm still waiting for the next chapter to cry more while still hoping for a happy ending
Note that it's an omegaverse, also violence/rape/angst themes.
https://www.mangago.zone/read-manga/into_the_rose_garden/
https://www.mangago.zone/read-manga/hanbun_ageru/ this had me sobbing crying
please recommand me the most heartbreaking yaoi you ever read, i wanna cry until there isn't any teardrops left on my eyes