Hugh Hefner's ex fiancee (as of Tuesday) Crystal Harris gave an interview to Ryan Seacrest Wednesday morning to explain why she suddenly called off her wedding only days before it was scheduled to happen (it was scheduled for Saturday).

The Playmate started off the interview with "Hi! I'm doing good!" to which Seacrest responded, " ... You sound chipper." She quickly changed her tune, saying, "I'm doing OK."

Says the Playmate on 102.7 KIIS FM:

    "I called it off because I didn't think it was the right thing for me to do. ... For a while I've been having second thoughts ... I didn't think it was really fair to him. ... It was all happening too fast for me."

Internet rumors Tuesday were that the two had a blow-up fight and Harris, 25, moved out. She paints the incident in a more calm light.

    "It was mutual between Hef and I. There was no fight ... He understood. We both agreed that it wasn't the best idea to get married. ... He was doing it for me because he thought it was what I wanted."

Hef seconded that via Twitter, saying:

    "The TMZ report that Crystal & I "had a nasty argument," prompting her to call off the wedding, is untrue. There were no arguments."

Ultimately, Harris says that the Playboy life Hefner, 85, leads was too much for her. "This isn't the lifestyle for me; multiple girls all around, it's not the lifestyle I wanted," she said.

Harris told Seacrest that Hef is "doing great."

She confirmed that she has moved out of the Playboy mansion, but, denied the rumor that she's dating someone else -- supposedly Dr. Phil's son, songwriter Jordan MacGraw. "Of course, I have plenty of friends in the music business," she said.

    "Next steps are work on more music and excited for the single to come out ... I'm working on a whole album. ... I sing, I write."

The former Girl Next Door also talked about what her relationship is with Hef now and whether Hef will marry again ... see what she said after the jump!