OK! EXCLUSIVE: Jake vs. Vienna — Did She Cheat?

Amidst the news that The Bachelor's Jake Pavelka and fiancée Vienna Girardi have split, which OK! exclusively revealed last night, cheating rumors are abounding. While sources close to Jake reveal that he's heard she was unfaithful, Vienna's camp swears it's not true.

"He was working when he heard she supposedly cheated and was very hurt by it," a pal of Jake's tells OK!. "His love for her was very real and he is heartbroken and sad things are ending this way."

OK! EXCLUSIVE: JAKE PAVELKA & VIENNA GIRARDI — IT'S OVER!

However, a source close to Vienna tells OK!, "Vienna swears up and down she didn't cheat."

Greek actor Gregory Michael admitted to OK! that he danced the night away with Vienna at Saturday's CHOC Oncology Prom near L.A. before asking her about the sparkling engagement ring on her finger from Jake.

"I really and truly didn’t have any clue who she was until the end of the night," Gregory confessed to OK!. "That’s when I asked her about the ring and if she was with anyone. I was very careful that it was over with Jake before I did anything."

It seems Jake is convinced that Vienna hasn't been true to him, as his pal explains to OK!, "Jake has no tolerance for infidelity and is instead just going to stay single and focus on his work. He doesn't think he and Vienna will remain friends after this."

That fact might not be so troubling to Vienna, as Gregory reveals that they already have discussed meeting up again soon.