Some here❣
http://www.mangago.me/home/mangalist/554928/
you can try this ^^
some have good ending i hope its ok
http://www.mangago.me/read-manga/mou_ichido_nando_demo/
http://www.mangago.me/read-manga/10_years_where_i_loved_you_the_most/
http://www.mangago.me/read-manga/kashikomarimashita_destiny/
http://www.mangago.me/read-manga/bokura_wa_nando_mo_koi_o_suru/

Does someone have a list of sad or tragic bl mangas?
Or some recomendations?