Like someone said in the beginning of the thread... I think that they're soulmates. They're meant to be together, but whether they're together in a romantic way or not doesn't matter.
Personally, I believe in reincarnation. To me, it's the soul that matters, not the body housing it. I don't think that souls necessarily have genders, but attributes that humans categorize into typically "male" or "female." Also, I think that a soul can find another soul that harmonizes with it (in a way). I guess you'd call that a "soulmate." (Also, I think that it's possible to have more than one soulmate.)
But romance is an entirely different matter. To me, romance is just physical attraction mixed in with some brain activity that we're programmed to have so our species doesn't die out. So, it's possible to fall in love with someone who doesn't "harmonize" with you.
Also, it's possible to fall in love with someone who does. I personally believe that one of your soulmates isn't necessarily the person you're meant to "be with" for the rest of your life. Usually (according to myself, at any rate), one can mistake the feelings one gets for a soulmate as what we call a "romantic love." The feelings are somewhat similar and usually a tad hazy, so they're easily mistaken for something they may not necessarily be.
I'm sorry if I don't make any sense or if my beliefs somehow warrant spoiler tags.
So, the bottom line is this. I think that they love each other, but in a way that most people wouldn't understand. It's a very deep, complicated love that transcends the boundaries of an average person (not that I'm insulting anyone or their beliefs by using the term "average").
But, then again, isn't transcending boundaries a rather large portion of what the .hack series is about? (Yes, yes; that's an entirely different discussion.)
And there's my two cents without referring to any .hack//ZERO or ANALYSIS rumors at all.



