the island seems to dislike "love"
jack, sawyer, loche and kate (and to some extent, hurley) are the shows main grouping... and all of them have had awful love moments in life, pre-island. jack and his wife, kate and sawyer can't love anyone but have tried, loche and peggy bundy (hurley never having luck with women)
then, love is punished harsher on the island
sawyer and ana hit it off, ana dies
hurley and libby hit it off, libby dies
sayid and the blinde hit it off, the blonde dies
boone has that weird thing for his sister, he dies
michael loves his son, he is taken
claire had a baby out of wedlock/love, the others tried to steal it
mr dewitt and the black lady were in love, but forced to opposite sides of the island, thinking one another dead for weeks. i'd be interested to see how they fair.
jin and sun were in love and then sorta broke up, only later coming back together with another kid in the oven -- perhaps, like claire, in an effort to steal it.