We got Rick at LAX Monday, and asked about the family rift over Nicky's wedding ... where Kyle's hubby Mauricio was persona non grata.
Rick told us Kyle's upset at Bravo ... so upset she's given notice. Fact is ... we're told Kyle has threatened to quit in the past.
We're getting a very different story from sources connected with "The Real Housewives of Beverly Hills," who say what this is really about is that Mauricio is now a competitor of Rick's in the real estate biz. As for Kyle, they say she's going nowhere.