Maybe the Saudis are tired of bankrolling BAE for nearly 70 years with nowt to show for it in return?
BAe were promising home assembly to various Middle East nations as far back as the 1980s and nothing has happened. Here were are in the supposed age of wireless comms, digital design tools, 3D printing etc., should be easier than ever to rock up in Saudi and set up something. The excuses why it can't be done are going to wear thin.
BAE can't keep expecting Saudi to buy the next fighter they come up with every time just out of brand loyalty.
And let's face it, European defence money is always hanging on a political whim, oil money keep on flowin' until you run out of the stuff - so they know their petrodollars count for more bang in the long run.