1. https://www.mangago.me/read-manga/living_will/ it’s gl with a sad ending.
2. https://www.mangago.me/read-manga/anata_wa_korosu_tabi/ depend on your interpretations, it could be sad. Kinda confusing.
3. https://www.mangago.me/read-manga/life_senjou_no_bokura/ not a sad ending, but there is a break up from a long relationship.
4. https://www.mangago.me/read-manga/kosha_ura_no_natsu/
5.if you want a really sad anime, watch banana fish. Sad ending!
Of course the first thing that came to.my mind was "10 years where I love you the most"
https://www.mangago.me/read-manga/10_years_where_i_loved_you_the_most/
And if you really want to take a break from fluffy, read these: (they aren't BL tho, and not exactly tragedy either)
https://www.mangago.me/read-manga/brutal_satsujin_kansatsukan_no_kokuhaku/
https://www.mangago.me/read-manga/save_me/
December rain (has a happy ending tho)
I’ve been reading a lot of happy,soft, lovey-dovey mangas so pls recommend me some mangas with cheating, tragedy tags (preferably yaoi) it would be nice if they were short ones or one shots and not a happy ending !!! tnx ♡