Yes, the WAS has detached from you. Also to protect their detachment and their state of mind, they will start to see things in 180 degrees from normal.
A WAS will be hypercritical of you and impossible to please. They will find everything wrong with you, and your emotion or grasping for connection will disgust them.
As they go about their affairs, with each act, with time spent with the affair partner their priority and time is being spent and grown with the other person.
So you may find it hard to believe it happens so fast, but just realize from the experience on this board that it does.