Why was Jessica Simpson most upset by John Mayer's revealing Playboy interview (in which he called her "sexual napalm")?
"He gave away my game!" the star, 29, tells David Letterman on the Late Show, airing Wednesday. (Watch the clip above.)
"Normally you would think that somebody you care about would keep those intimate details to themselves," she says. "It was definitely compliment ... in a way. But I don't really want people to know that about me. It's like, I'm the good girl and then that happens."
Although she says she "was very disappointed by the article" and hasn't talked to him since it was published, she does say she "will always care about him."
The star of VH1's new reality show The Price of Beauty also opens up about her ex Tony Romo, who she says is "still a dear friend of mine" even though they split after two years of dating this past July.
"We're big Dallas Cowboys fans," she says of the Texas-based Simpson clan. "I still look at his cute butt in the outfit -- uniform!"
So, what went wrong?
"I don't know," she says. "You'd have to ask him that. He broke up with me on my birthday!"