Tragedy

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

Personally, some might be tearjerkers, but these are pretty mild.

I may not be the best person to answer your question as twisted & tragic BL is my forte, but I think these 2 stories might just be in your tolerance range -
http://www.mangago.me/read-manga/triangle_fuuki_mame/
http://www.mangago.me/read-manga/yuki_iro_machiboke/
They are tragic but also VERY SWEET with happy ending.

http://www.mangago.me/read-manga/hana_to_ryuu/
Definitely not a happy ending but so good you just can't stop yourself...

http://www.mangago.me/read-manga/hana_no_miyako_de/ This one is listed as tragedy, but I find it more heartbreaking than tragic. Really great read though. Enjoy!

lol i hate this one but i love it as well. such a great classic. the ending is not happy but it's a bomb and it's bittersweet.

Thanks for all the recommendations you guys!! I can always rely on this community haha

http://www.mangago.me/read-manga/jigoku_meguri/
http://www.mangago.me/read-manga/inu_to_tsubame/
http://www.mangago.me/read-manga/lonely_to_organdy/

Some of them have happy endings some not, some of them are very fcking sad and some not but here u go (=・ω・=)

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

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

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

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

http://www.mangago.me/read-manga/no_6/

http://www.mangago.me/read-manga/1999_shanghai/

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

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

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

https://www.mangaupdates.com/series.html?id=38871

https://www.mangaupdates.com/series.html?id=37130

I forgot descriptions! The first is a mix, some aren't sad, and some are mature tragedy. They aren't over the top.

The second is much more fiction than reality than the first, but just god awful sad. I ugly cried, and I don't ever cry over manga.