Nia Long -- I Love My NBA Fiance So Much ... I Want Him To Lose

Nia Long might NEVER want the San Antonio Spurs to win another ring ... telling TMZ Sports she sometimes roots for her fiance's team to lose in the postseason ... so he can come home.

Nia's fiance' is former Spurs stud -- and current assistant coach -- Ime Udoka and when we got the two out on date night earlier this week we had to ask if she was secretly excited when the Spurs got knocked out of the NBA playoffs.

Check out the clip -- Nia keeps it all the way real -- maybe too real for Spurs fans -- before dialing it back a little so she's actually allowed back in south Texas.