I think they are secretly together. I believe the hollywood producers are putting pressure on them not to go public because if their relationship were to fail it may decrease ticket sales for the remaining three movies. People may be disappointed that they are no longer dating. It is sad to say but people have their little fantasies that Robert and Kristen REALLY are Edward and Bella. I say so what if they are dating. They have such awesome chemistry on screen it wouldn't surprise me if they were.
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Robert Pattinson on Kristen Stewart: We Are Very Good Friends