I feel bad for you dude. Oh I'm sorry, I don't know with a recommendation but since I already read your pitiful question, I couldn't not reply. Why would you want tragedy to smear precious yaoi and shounen ai? Like perhaps the guys deciding that being gay will ruin their lives and so getting married to a girl kind of tragedy? I've wanted to read that kind as well...... and with the way "dakaretai otoko ichii ni odosarete imasu" is going, I'm expecting to be a random girl in the picture soon.
http://www.mangago.me/read-manga/jikan_akima_jinbutsu/
http://www.mangago.me/read-manga/eien_no_aida_ni_miru_yume/
http://www.mangago.me/read-manga/meiou_hades/
http://www.mangago.me/read-manga/to_the_sea/
http://www.mangago.me/read-manga/pure_dakkang/
http://www.mangago.me/read-manga/kimi_no_kanaderu_hikari/
http://www.mangago.me/read-manga/ashita_shinu/
http://www.mangago.me/read-manga/shinju_bl/
http://www.mangago.me/read-manga/ame_ni_niteiru/
http://www.mangago.me/read-manga/koi_no_katachi/
http://www.mangago.me/read-manga/bl_of_the_dead/
http://www.mangago.me/read-manga/golden_days/
http://www.mangago.me/read-manga/back_in_time_to_you/
http://www.mangago.me/read-manga/hybrid_child/
http://www.mangago.me/read-manga/500_nen_no_itonami/ (Not exactly tragic, but sad. Kinda bittersweet)
http://www.mangago.me/read-manga/hana_no_miyako_de/
http://www.mangago.me/read-manga/the_specific_heat_capacity_of_love/
http://www.mangago.me/read-manga/my_heaven/ (It can be taken as shounen-ai, yet it also can be taken as not shounen-ai.)
YOU! YES!! YOUU!! THE ONE READING THIS PITIFUL QUESTION OF MINE, do you perhaps know of any yaoi/ shounen ai tragedy manga/ manhwa that you could possibly recommend to this pitiful disgrace of a human? Because i badly need it.
THANK YOU IN ADVANCE KIND READERS~ !