 Tina's sisters Michaela (Hollie-Jay Bowes) and Carmel McQueen (Gemma Merna) overhear Dom speaking lovingly on a phone to "Cathy", a character from he and Tina's favourite book, who they assume to be Kathy Barnes (Sarah Jane Buckley) and accuse Dom of having an affair.Dom then proposes to Tina, which she accepts.Just before their wedding day, Tina discovers Dom and Mandy's past feelings for each other and feels she cannot trust him.