Any really sad BL story where they make you cry

http://www.mangago.me/read-manga/hana_no_miyako_de/

http://www.mangago.me/home/mangalist/130530/

it's....a variety of sadness. Not always death involved. hopefully you find one you like.

http://www.mangago.me/read-manga/sairuiu/bt/c005/pg-2/

http://www.mangago.me/read-manga/thank_you_my_god/
http://www.mangago.me/read-manga/end_game/
http://www.mangago.me/read-manga/500_nen_no_itonami/
http://www.mangago.me/read-manga/hebi_no_seikatsu/
http://www.mangago.me/read-manga/kimi_to_parade/ (prequel)
http://www.mangago.me/read-manga/paradise_view/(sequel)