心的外傷後ストレス障害
On June 23, 2017, Moulton announced on Twitter his engagement to his girlfriend Liz Boardman, a senior client partner at an executive search firm. They were married at the Old North Church, Marblehead, Massachusetts, on September 22, 2017. The couple welcomed a daughter named Emmy in October 2018. In 2019, Moulton announced, during an interview with "Politico", that he was suffering from Posttraumatic stress disorder (PTSD), following his service in the Marine Corps. On August 29, 2020, Moulton announced that the family was expecting a second child, another daughter who was born in February, 2021.