User blog comment:KoolioPhoebe/DID ANYONE ELSE JUST SEE THAT?!!?/@comment-1756703-20100623041946

@Tylerxlindsaysupporter: I'm an ardent DxC fan, but I'll be one of the first to admit that the DxG kiss is most likely real. I'm not trying to put myself in denial by falling back on theories that it was all just a dream or that the kiss is part of a challenge. However, the reason I brought those theories forward in the first place is to highlight the fact that we don't know anything about the circumstances surrounding the kiss yet, so for all we know, it could be just a dream, or it could be part of a challenge. But given the practically non-existant info that we have at our disposal right now, Occam's razor would have me concede that Duncan probably did kiss Gwen and that he probably did dump Courtney in the process.

And don't worry about finding possible reasons for why DxC will stay together in the end despite the DxG kiss. I've already put forward a couple of solid reasons, which can be found here and here.