Yes, and that was a cruel, stupid move on the US’s part.
…But even if cooperation continued, it still would have given Iran expertise. Further enrichment is not a huge step, especially behind the cover of real civilian power programs, and given the rhetoric the state broadcasts and their neighbor’s hostility, it seems likely.
And that’s fine IMO.
I’m hugely afraid of proliferation, but going to these lengths to worry about it while the rest of the world burns seems ridiculous.