Cersei Lannister: What was she like?
Robert Baratheon: You've never asked about her, not once. Why not?
Cersei Lannister: At first, just saying her name, even in private, felt like I was breathing life back into her. I thought that if I didn't talk about her, she'd just fade away for you. When I realized that wasn't going to happen, I refused to ask out of spite. I didn't want to give you the satisfaction of thinking I cared enough to ask. Eventually it became clear that my spite didn't mean anything to you. As far as I could tell, you actually enjoyed it.
Robert Baratheon: So why now?
Cersei Lannister: What harm could Lyanna Stark's ghost do to either of us that we haven't done to each other a hundred times over?