Just follow the link for the details. The bottom line is this. ABC had to walk it all back because:
1) Their source wasn't who they said he was, and
2) Their source retracted the main point of the story, reducing it to--ready?--mere gossip.
Really. I'm not kidding.
As John Nolte says:
The central premise of the story has been wiped out by the facts. But, as we all know, ABC News is not a legitimate news organization ...