That is weird , however there is little that surprises me these days. Its almost like two different personalities.
The "I dont want anything from you " person then the person that uses "us" and "we" and talks as if there is a future together.
I think its the "not totaly gone" personality (we should call them NTG's rather than WAS's). For example my W will do the same and not want me to do anything for her, then a few days later I am riding my bike and see her drive past in my car! , picking it up from home and using it just as if we were still together. She will say " we should get " or other things that indicate that she thinks there will be a we , then later say its too late , all over blah blah if I ask her out.
If you try and figure this stuff out you are going to go crazy . I think they follow feelings rather than logic , have no plan , no goal. Just lost.