The Married at First Sight Australia bride slept with Paige Turley‘s Finn the night before the MTV show’s launch party.
Horrified by the so-called “betrayal” of her friend, Tamara was frozen out of the group.
She was later seen visibly upset after rows with the cast out of sight.
A source told The Sun: “The cast was rocked by Finn and Tamara’s fling. They felt really uncomfortable for Paige who they’d grown close to.
“At the party, the girls sided with Paige and kept their distance from Tamara.
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“Tamara was heard telling guests she was having a ‘miserable’ time and they were ‘all being so mean’.”
Finn slept with his co-star Tamara – despite trying to win back his ex Paige.
Love Island exes Paige and Finn split in April 2023 after three years together.
It was an amicable split, with Paige admitting they’d “lost themselves in each other” after winning winter Love Island and moving in together straight away.
They both signed up for Celeb Ex on the Beach, filmed last year, and were on track to reuniting after an emotional breakthrough.
However, Paige discovered Finn had slept with their co-star Tamara the night before the MTV show’s launch party which they all attended.
Tamara found fame on Married At First Sight Australia 2019.
Her husband Dan Webb had an affair with married contestant Jessika Powell.
The Sun has reached out to Tamara’s rep.