I wouldn’t say the US is backstabbing their allies. That is a bit of a stretch… at least, not as bad as Rheinmetall / Germany has failed to support their customers for example.
The Meteor has a very convoluted history, the US defense industry is profit driven… anyone could have seen this coming. When NATO isn’t so dependent on the US for support you might see a change in the way these things go… until then, this is what you can expect.
In regards to being “behind” … that couldn’t be further from the truth. The US has been well ahead of other nations in many aspects from stealth, electro-thermal-chemical guns, radars, missile design, propellant performance, etc. Raw production capacity, research funding, etc all assists this.
I think one of the best ways to make my point is to look at the AMRAAM program. The initial designs from Raytheon were wingless tail controlled missiles similar to the ASRAAM. In fact, it was these studies that helped the UK develop the ASRAAM in the very beginning. The ASRAAM is built around the same design philosophy as the early AIM-120 models utilizing body lift.
Lockheed beat them to it I suppose.
https://aviationweek.com/term/lockheed-martin-aim-260-jatm
The irony being that the AIM-260 is a wingless body lift missile similar to ASRAAM design, and very similar to Raytheons original design contender for the AMRAAM program.
Also the same as Northrop’s design;
If I recall, the Meteor was also a wingless missile early in the development phase before it became what we know of it now, no?
Anyhow, the integration of weapons onto existing platforms has been a process absolutely strapped in red tape since the 70s. Look at the attempts to integrate the AIM-120 onto the F-14. The US sabotaged themselves in that respect, too. It’s all just politics.
Although they recently fielded a missile with considerably more range and higher NEZ than the Meteor… it just isn’t being fitted to any stealth fighter (soon?). ~600km range?