Konichiwa:
That's too bad, especially because you've been good friends and have been able to become closer to one another - to foster that emotional "commonground" you need before anything more can happen. But with your case, it did happen, and... I can't say anything more than that it's a really...unique situation. One that's hard to really analyze without having a greater background about.
Mind if I ask what were the reasons why it didn't work? I know you said that you didn't know, but I'm a firm believer in the adage, "There's a reason for everything", and I think that...if you really look back and remember the times you were together and the things that you said (or -didn't say) to each other, you'd probably be able to see just where you went wrong.
Overall though, I'd have to disagree about whether you could be "just friends" with a member of the opposite sex. Although, yes, so much of it depends on the people, their jobs (?), the degree to which the relationship had reached/evolved, circumstances, and so on. ... I think generally, as with any relationship - at the root of it, you're just friends. You enjoy each other's company. And friends come and go all the time. So (of course depending on how far the relationship was to start with) given enough time, a feud or disagreement or even just... the incompatibility can realistically resolve itself. If you have a talk where you achieve some sort of understanding between each other, and agree on where each other stands, I would think it'd lead to a much better chance of resurrecting the friendship and perhaps even... strengthening it.
I think those ties that you had with the person are still there, but some of them have fallen loose from one another and if you were good friends to begin with, they would eventually find a way to re-tie themselves together given enough time and distance away from one another. I've been in a situation something like that, and I believe (and hope) that the awkwardness of talking and seeing one another decreases with time, until slowly but surely you're able to speak as *friends* once again, and not just as acquaintances who "once were".
What do you guys think of this?
(p.s. the terms "guys" was not used with the intention of exclusion...)
Anyway, hope you find better shades of light in the future and this doesn't stand too much in the way. I know somebody who once told me she was "jaded" because of men, and that men are dogs... but things have taken a different route lately.
-p