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Ive read those and it truly heartbreaking.. sorry i also forgot the title.
is Dakedo, Ashita no Hanashi o Shiyou http://www.mangago.zone/read-manga/dakedo_ashita_no_hanashi_o_shiyou/ the story you are looking for?
OMG! YES! I truly believe this is it. Thank you so much, you have no idea!
I've posted it before but unfortunately no result in finding the one that has my mind in stitches. Its a yaoi manga, the main Character had twin brother who died. Thee said twin had a male partner. So after the death of the brother, the main Character takes his place and becomes the replacement taking par of the relationship. Because (I believe) he blames himself for his brother's death. And (I think) he already loved his brother's lover to begin with, or started when he became the replacement. Its been killing me trying to figure out which manga this is. I want to say this is a short manga, or from a manga that is piled with oneshots. But then again I could be wrong.