That is the hardest thing to really "accept". Time. It takes time. Feelings come back.
I oftentimes worry about this. If the W states that she doesn't think she was ever in love with you (not sure my W said this), how likely is it that she can be? I don't know. To try and and put myself in the WAS's shoes, I try to go back to a time when I was dating someone and decided I didn't want to be with them anymore (I have to go back to highschool for this, though, so I'm not sure I can really apply it to adult sitchs). I question if I could be in love with that person today, and I keep getting this "no" answer each time. That's what scares/worries me so much. However, that POV doesn't have any big changes thrown in. Maybe if they were different people, then possibly...
