Board Thread:Questions and Answers/@comment-5993147-20131027123715/@comment-20644-20131102001126

This is a question I always had too. Dave Filoni just said in an interview, though, that Ahsoka's character was all about Anakin's fall to the dark side. Way back in The Clone Wars movie, Yoda said that Anakin having a Padawan was a test to see if he could let go of his attachment to her once it was time for her to leave him. That ties right into Episode III, where Anakin's attachment to Padme led to his fall to the dark side.

I've always thought that perhaps something happens to Ahsoka, or between Anakin and Ahsoka, that causes him to never speak of her again. Maybe she dies before Episode III (in the remaining episodes of The Clone Wars) or they have some sort of falling out now that she's left the Jedi Order. Something big enough that would lead to Anakin saying "never mention her to me again," but where we could still see how The Clone Wars helps set up the rise of Darth Vader.