This one is the one that was really depressing for me, classic
http://www.mangago.me/read-manga/hate_mate/
Not all these are yaoi but they're all good. http://www.mangago.me/home/mangalist/296381/
These made me freakn cry and maybe they will be too for you
http://www.mangago.me/home/mangalist/337188/

I really a few best yaoiiii that make me cry. And I want some moreeeeeee. Hahahahahaha I just wanf to hurt myself. Can some recommend a good tear jerk yaoi manga? Thank you!!