"It was working"

I'm trying to discuss what that means, because I think that's where we are disagreeing.

What does that mean to you?

To me (and it's crafters) the JCPOA "working" meant slowing Iran down temporarily.

Comparing their progress towards building a bomb under and after the agreement? We know they followed the agreement with minor discrepancies, and when sanctions started they started breaking it. With no diplomatic agreement and sanctions in place what should Iran be doing? Might as well build a bomb then.