http://www.mangago.me/read-manga/10_years_where_i_loved_you_the_most/
Try this, i think its a popular heart breaking manhua..
It's still ongoing though...
http://www.mangago.me/read-manga/hana_no_miyako_de/
http://www.mangago.me/read-manga/itou_san_kuraka_sui/
http://www.mangago.me/read-manga/smells_like_green_spirit/
http://www.mangago.me/read-manga/paradise_view/
http://www.mangago.me/read-manga/namida_kareru_na/
http://www.mangago.me/read-manga/lonely_to_organdy/
http://www.mangago.me/read-manga/life_senjou_no_bokura/ (Seems fluffy - and will stay fluffy - but wait till the extras)
And not to forget: http://www.mangago.me/read-manga/ze/
http://www.mangago.me/read-manga/lonely_to_organdy/
this one brings me to tears whenever i even think of it!
Please recommend me few heardbreaking yaoi. Thanks