joseph o'riordan , 76 , left his wife mandy , 47 , with life-threatening injuries to the chest , torso and back after flying into a rage over her infidelity .
but today it can be revealed that her married postman lover , nick gunn , 41 , had previous affairs with women on his rounds .
the couple had been married for ten years and had attended the queen 's garden party in 2013 for o'riordan 's work on the diamond jubilee celebrations .