"Crystal lied about our relationship on Howard Stern but I don't know why. Maybe a new boyfriend?" Hefner wrote in a since deleted tweet about the former The Girls Next Door star's recent claims that the couple only had one brief sexual encounter during their two-year relationship.
"[It lasted] like about two seconds," Harris told Howard Stern during a Tuesday appearance on his SiriusXM radio show, adding that she never even saw the 85-year-old Playboy founder and editor-in-chief naked.
While the 25-year-old former Playboy Playmate suggested in the interview she was truly in love with Hefner but called off their June wedding just days before walking down the aisle because she changed her mind about marriage, Hefner said it was just another falsity.
"Crystal convinced me that she adored me. That was the first lie," Hefner wrote on his Twitter account.
"When I said, 'I missed a bullet' when Crystal left, I didn't mean I didn't love her. I meant I realized she really didn't love me."
Hefner -- who got engaged to Harris over the holidays last December -- subsequently tweeted how he "feels sorry for Crystal" and she "seems lost" but proceeded to clarify how he's doing just fine after the breakup and is ready to move forward with his life.
"[I'm] happy to be in a better place with new girlfriends Anna Sophia Berglund and Shera Bechard," he added.