While the former second-season Bachelor Pad contestants moved in together in August and Girardi -- who was previously engaged to former The Bachelor: On the Wingsof Love star Jake Pavelka -- claimed they had "an amazing relationship" and only fought when they weren't together because they hated being apart, the tables have turned, according to Life & Style.
"Vienna broke up with Kasey a few weeks ago. They'd been fighting about everything. It just wasn't working anymore," a former The Bachelor contestant close to Girardi told Life & Style.
"They both moved out of the LA place they'd moved into together. Vienna's moved back to Florida, and Kasey's moved home."
Girardi reportedly thought she and Kahl -- who had been dating for eight months -- simply needed some separation, but she has not ruled out the possibility of getting back together down the road.
"It's anyone's guess about what happens next," the source added.
"But for now, Kasey is very, very hurt about it. He thought they were going to spend the rest of their lives together."