It took a while before Kelly started talking about Graham. Kelly isn't one to talk about her relationships. Just because you didn't hear about David doesn't mean she didn't date him.
Like someone else said, it's too bad more stars don't follow Kelly's lead and keep their relationships more private...they might last longer that way. Although, on the flip side of that, they often don't CHOOSE to expose their relationships...the y're exposed FOR them by the media. Kelly's been pretty lucky with that.