He told her: "Anything Nicole says to you, you pick on her."
Kat told Rex he had "got it wrong", then went to the garden and burst into floods of tears.
Rachel went after Kat, who was defending herself to the jailed Mohamed. "I didn?t even know what Nicole said. I didn?t say anything to anyone," she bawled.
Rachel was lost for words and said the whole thing had been blown out of proportion, while Mo offered the explanation: "Rex is just upset because Nicole's up for nomination."
Rex had seen that Kat was upset and finally went outside to talk about their row.
In between sobs, Kat explained that she was upset as Rex did not hold their friendship in high regard.
Rex finally apologised, going on to say that everyone makes mistakes.