Could this story be, perhaps (as Master Elrond is SOO fond of saying..), an explaination as to why Elrond doesn't want Arwen to marry Aragorn in the movie? His experiences with the pain of loving a mortal...

And there, on a beir in the center of the hall, lay Elros. My brother. Dead. Cut down by age, the enemy we elves never need face.
Elros was no elf.
Tar-Minyatur, he had been called in life. First King of Numenor. But he had never been that to me. My brother.
I knelt, trembling, beside the beir. Elros' white hair was arranged neatly about his shoulders, his eyes closed forever, his fair hands folded at his waist.
True, we had grown apart over the years.
But I wept for him, silent sobs shaking my body.
Apart now forever.
Through my tears. I stared at his still, pale face, and it was then that I fully understood the curse of mortality.
Or was it, perhaps, the curse of being immortal?