Ryan 'Fitzy' Fitzgerald was caught off-guard on The Project when Tommy Little questioned him about his former fling with I'm A Celebrity's... Tziporah.
After the subject of Valentine's Day came up, Little asked Fitzy: "Who dumped who? T'ziporah or you?"
Fitzy, caught unaware, dodged the question and turned bright red.
Earlier in the week, the I'm A Celebrity... hosts Dr Chris Brown and Julia Morris joked with the radio host about his ex-fling.
"Tziporah has been very testy the last few days... Fitzy would you have any clues as to how one might I guess placate Tziporah and make her feel good given your history?," Brown joked.
The ex Big Brother star laughed it off and replied: "Stuff you Browny! Browny we're losing you mate, have a great night. See you guys."
Last year it was revealed Fitzy briefly dated Tziporah after she split with James Packer in 1998.
He admitted they kissed on the lips but haven't kept in touch since.