The driving force behind Meghan Markle and Prince Harry’s marriage “crisis” has been uncovered. RadarOnline.com can reveal insiders claimed the Duchess of Sussex made the royal renegade feel like a “spare part” during their recent travels to Nigeria and South America. Instead of being pushed to the shadows, Harry, 40, has since stepped into the spotlight and embarked on several solo trips and appearances. Harry has recently made two trips to the U.K. without Markle, though he previously claimed it was no longer “safe” for his wife and children to travel to his native England without amped up s…