A "happilish" ending is not what I look for in fiction. Particurarly not in "pornoromantic" fiction... -_-
At least one truly good ending should be possible.
I'm
not asking for
all good endings... But between "all good endings" and "no truly good ending possible" there are a lots of possibilities in between those two extremes.
To practice acceptance of loss and sorrow there's already real life.
In fiction I'm looking for
escape, not for worsening my depression.
I think that's what 98% of us is looking for at least in
this kind of fiction. For depressing fiction there are specific genres!
Maybe I was the one who couldn't bear the thought that
I let a girl I loved and who loved me back burn alive - besides she was the best friend of my future wife 
how could I be even
moderately happilish with such a remorse in my mind? I would never want
to have a child when both my wife and I are in a such horrible mental conditions. That would be unfair for our child to have mentally suffering parents