The woman involved in a sex scandal with former New South Wales Health Minister John Della Bosca has broken her silence, calling the backbencher ego centric.

Mr Della Bosca resigned after it was revealed he had an affair with Kate Neill.

Speaking to Ten News, Ms Neill explained why she went to the media with the story.

"I wanted to tell people what he is really like. I would really hate my state to have a premier like that," she said.

She said Mr Della Bosca told her he was sick of playing second fiddle to Premier Nathan Rees.

"The only political things he talked to me about were getting one-upmanship with Nathan Rees and cancelling each other's media opportunities," she said.

Ms Neill's appearance comes as Labor figures slam Mr Della Bosca for giving a newspaper interview which is being interpreted as a bid for the leadership.

The ABC has been unable to contact Mr Della Bosca for comment.