Courtney fears that ‘Bachelor’ Ben Flajnik will learn the truth about her dark past if her ex reveals her scandalous video and other compromising secrets.

Ben Flajnik is falling hard for cunning model Courtney Robertson, who uses her sex appeal to lure him into her trap. While Courtney convinced Ben to get naked and go skinny dipping with her, that wasn’t the first time she pulled such an outrageous stunt. Courtney filmed a “dirty” sex tap with her ex-boyfriend Cavan Clark, who she was planning to marry until she got the call to go on The Bachelor, an insider reveals.

Before dumping Cavan, they filmed a tape to capture their intimate moments. “It’s pretty dirty,” the insider tells Us magazine. “There are photos, too. But it isn’t Cavan’s style to release them.”

Courtney was supposed to marry Cavan. “He was planning to propose to her with a 3-carat Tiffany ring that she picked out,” a source shares.

But Courtney dumped him as soon as she got the call in July to do The Bachelor. “She told Cavan she needed time to be single,” explains the source. “She told him she needed three months alone.” Cavan learned the truth when he saw Courtney on TV a few months later.

Courtney has a scary past of using men. “She’s like monkey,” the source notes. “She won’t let go of one branch until she grabs hold of another — and she’s always looking for a better branch. She wants to snag a rich dude.”

Now, Courtney is pulling her moves on poor, unsuspecting Ben. “She knows exactly what to say to guys,” says the source. “Her best line is before having sex with a man. She’ll ask him, ‘Are your ready for your date with destiny?’”

Still, Courtney is “worried about her ex exposing secrets about her,” claims another source.

Hopefully Ben learns the truth about Courtney before it’s too late.

More Bachelor News:

1. ‘Bachelor’ Ben Flajnik’s BFF Slams Courtney Robertson: She ‘Lacks Real Depth’
2. Courtney Robertson ‘Acts Like A Stripper’ For ‘Bachelor’ Ben Flajnik, Says Former Contestant
3. ‘Bachelor’ Host: Courtney Robertson’s Aggressiveness Will Win Ben Flajnik’s Heart