Well, because in that universe, it did turn out like that, I'd guess. I mean, sure, I see the antagonism leading to romance bit, BUT that Leia's also the leader of a planet and a PRINCESS. The idea's hilariously weird for a lot of reasons, not the least of which being I couldn't imagine being in charge of all of THAT, or dealing with Alderaan and that messy fallout. I don't know how Luke takes it, honestly.
Lifeday presents this year. Just you wait. :P And yeah, Biggs was...I don't think there'll BE anything else in the universe for me. I could be wrong, but if not, it's not something I MIND, since I got lucky once, you know?