Does this have a tragic ending? Or a happy ending? I wanna know before I read coz I refuse...

I'll just spoil it....Read if u want.
.
.
.
.
.
The two boys in the starting of the story r madly in love, from school to high school till college.... Then they start working, the girl who works at the company like the other black haired guy, somehow he invites her to his home and they have sex and she gets pregnant.
.
.
The black haired guy leaves his lover and gets married to the girl, and has a nice family with her, she then suffers from lunge cancer like after their child is 5 of something and dies, then ahe confesses in onr of the letters that she was always Jeoulos of their gay relationship and wanted to get between them.... She then on her death bed tells the white haired guy to take carr of both of them.!!!! Done read if u want....
.... There r some conservative opinions, also it's a very very old manga, so don't expect justice!!!!

ohmyy this is gonna be an emotional rollercoaster