For now, all I can think of are these: Cut, Brother x Brother, Jigoku Meguri, and Little Butterfly.
Oh yeah, I just remember these 2 extremely sad mangas, Zetsuai and Bronze by Ozaki Minami. They are both old mangas, so the art is pretty old too.
Miyamoto Kano works like Are you an Enemy? or sensei Minase Masara works like Lover's Position and one of my favorites Doushitemo Furetakunai
o and Running on Empty , Let Dai ,Savage Garden
Try Pathos. It got me crying a bit.
Boys love is really one of those.
Dog Style is not sad, but I was crying on the ending.
Not yaoi but shounen ai, Banana fish.
plz somebody suggest a very sad yaoi yet so romantic.i like that kind of yaoi.onegai...