MANCHESTER, N.H. — Rudy Giuliani cheated on his wife with a married New Hampshire hospital administrator, multiple sources told The Post. The mayor-turned-presidential lawyer, 74, and Maria Rosa Ryan, 53, began their affair before he and wife Judith Nathan separated last month — and Nathan filed for divorce five days after the pair was spotted getting cozy at a resort hotel in the Granite State. Giuliani, who has recently been the face of President Trump’s legal team, denied the affair to The Post Tuesday after it broke the story of his relationship with Ryan. He acknowledged that he and Ryan...