It happened around March this year.
Kobe and Dwight talked on the phone and Kobe told Dwight he would be third option behind him and Pau, and Dwight than lost nearly all interest in being with the Lakers from that point on. Hence his anti-Laker stand.
That thread says it all
Again who is the source? When asked neither player has confirmed anything. There are "sources" claiming to have talked to Kobe and he said it never happen. Anything not directly from the mouths of the players is not worth mentioning because the rumors rarely are true. The inside experts rarely get anything right when it comes to where players are going. And when they do its about as accurate as any random person posting sh*t they think might happen.