Anyways this is why it's dangerous to be too close to members of hte opposite sex once you're married, (there was a very recent article about this in I think the Awake..?) you could be "just friends" but what if you start to think "oh i could have been happy with this person" and problems arise.
I think everyone deserves to be the love of someone's life, hehe. And once you make your choice you can't think about those other possibilities .. ever, really. It's not fair to anyone involved.