Recommendations

Lessons in lust

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

Here
http://www.mangago.me/read-manga/black_lotus/
http://www.mangago.me/read-manga/legs_which_cannot_walk/?IUVd

Tragedy/real sad
Rent boy
10 years where i loved you the most
December rain
Lonely to organdy

Real sad but not tragedy:
Incidentally living together
Chew and swallow
Stigma
Sabita Yoru Demo Koi wa sasayaku

Psychological
Escape into oblivion
Moritat
Psycho
How to kill a heart (real sad too)
The perfect relationship
Warehouse (pretty crazy)
Obey me (real crazy)
Killing stalking (reeeeal crazy)

Saezuru Tori wa Habatakanai
I love that one :)

Sad :
Yuuutsu na asa (angst)
Life senjou no bokura (happy end but still sad)
Lonely to organdy
Bena
Shounen no Kyoukai (akabeko)

Drama

Kashikomarimashita destiny
Viewfinder (yamane ayano)
Saezuru tori wa habatakanai and related series
The whole doukyusei series until blanc by nakamura asumiko
The whole Renai-rubi no Tadashii Furikata series + Sabita Yoru Demo Koi wa sasayaku + hadakeru kaibutsu

Psychological:

How to kill a heart (must read its a roller coaster ride of emotions and its very well done)
Sakura gari (sad)
Double Mints
Copernicus no Kokyuu
J no subete (sorta sad)
The inheritance of aroma (incesty but ugh my harto the angst)
Caste heaven
Ouji no Hakoniwa
Ibitsu no kakera (incest)
Choco strawberry vanilla
Tourou No Ori
Despicable (Psyche Delico)
Dear My God
Inu mo Kuwanai
Sora o daite oyasumi (sad)
Acid town (pain)
Sankaku Opera
Itou-san (Kuraka Sui)
Void (zaria)
Ten ten shiro shiro
Classmate (Asada Nemui)
Niichan (harada)
Color Recipe
Yoru to Asa
The beast must die
Painter of the night
Killing stalking
Skin (asada nemui)
To the sea (asa nemui)

Since so many ask about sad BL these days, i actually made a list of completed, saaaad bl
http://www.mangago.me/home/mangalist/1017755/

This is a good list!