There's a deep mistrust of USA in Pakistan. They simply do not have that type of relationship where secrets are shared. US is the country that kept Pakistani payments for a decade but refused to provide the paid-for weapons; sanctioned Pakistan and instead gave them an equivalent amount of soybeans which American producers had in excess. And China is the country that provided Pakistan with a lifeline at that time under sanctions. There's no way Pakistan will ever cede that relationship with China for favor with US that is known to be unreliable, dishonest and dishonorable. Pakistani leadership and public both are well-aware of this.