Jake Pavelka's suspicions that Vienna Girardi was cheating on him reportedly led to the end of their relationship.

The Bachelor: On the Wings of Love star ended his engagement to Girardi because he believed she was "stepping out" with actor Gregory Michael, sources told TMZ in a Tuesday report.

Pavelka and Girardi issued a statement late Monday night confirming their split after rumors began  circulating on Saturday when she allegedly told Michael her engagement to Pavelka was off.

Girardi denied she had cheated on Pavelka with Michael, however he still decided to end their relationship around 6PM Monday night in a phone conversation, according to TMZ.

Girardi subsequently issued a public denial.

"The accusations of me cheating are completely fabricated. 100% False," she wrote in a Tuesday posting on Twitter.

Although it was Pavelka who allegedly spearheaded the split, a subsequent TMZ report on Tuesday claimed that Girardi also wanted out of the relationship because she felt Pavelka was a "fame whore."

Girardi felt that Pavelka "constantly abandoned" her for photo shoots and other media events instead of working on their relationship, TMZ reported.

Pavelka presented his final rose and a marriage proposal to Girardi -- and she accepted both during March's The Bachelor: On the Wings of Love finale broadcast, which filmed last fall. The couple subsequently told reporters they "definitely" would wed.

Pavelka and Girardi stayed together in Los Angeles while he competed on Dancing with the Stars tenth season, in which he finished seventh with professional partner Chelsie Hightower.

On Friday, Pavelka began taping scenes for a late-August appearance on Lifetime's Drop Dead Diva.

Pavelka has previously denied former girlfriend Tanya Douglas' claims that he's "fame-obsessed" and insisted he is not looking to pursue a Hollywood career.