Peter Orszag, who ditched his White House post as director of the Office of Management and Budget last June, now claims he never wanted to take the job in the first place. “I didn’t want to do it,” he tells New York magazine in the issue hitting stands tomorrow. “Having worked in a White House before, I knew how the infighting can become all-consuming, and I didn’t want to fall into that trap again. Many of my mentors warned me that despite the ‘no-drama’ Obama campaign, once in office, this White House would inevitably be like others — and possibly worse. And unfortunately that’s exactly what happened.” Orszag, the first of President Obama‘s appointments to resign, left the job several months after The Post first reported on his own family drama: He dumped his pregnant girlfriend, Greek shipping heiress Claire Milonas, before getting engaged to “Good Morning America” correspondent Bianna Golodryga. Orszag now serves as a chairman at Citigroup.