Nia Long and Ime Udoka are done -- the couple of 13 years has reportedly broken up after the Boston Celtics coach's affair with a team employee.
The news comes less than three months after the Boston Celtics suspended Udoka for the entire 2022-23 season for violating team policy ... a public scandal that Long said was "devastating."
As TMZ Sports previously reported, Udoka had an inappropriate relationship with the Celtics' travel planner ... who was in charge of booking Long's flights to attend home and road games -- as well as her arrangements to move to Boston permanently.