Nia Long says she's gonna need all the support she can get after getting blindsided by her fiance, Celtics Coach Ime Udoka ... who we've learned kept her in the dark about his affair, even though the team busted him months ago.
Sources connected to the team and the couple tell TMZ ... Nia had moved to Boston with Kez, her 10-year-old son with Ime, just 2 weeks ago, and the couple was house hunting.