By Olivia Wheeler Emmerdale is set for explosive scenes next week as Nate Robinson ‘rumbles’ his wife Tracy Metcalfe’s affair. Only recently, Caleb Milligan and Tracy have embarked in a shock affair despite the latter being newly married to Nate, whose uncle is Caleb. On Christmas Day, the duo were rumbled by a shocked Moira Dingle, who ordered Caleb to end his relationship with Tracy. After being rumbled, Caleb put an end to their affair, leaving Tracy both devastated and humiliated. Later, Tracy decided to get revenge by blackmailing Caleb into supporting her nursery project or she would tel…