What does it mean when you hang out with a female friend fairly often, have chemistry, but change between finding her repulsive and finding her attractive from one day to the next?
It means you need to date women who are not your friends.
Welcome to THE DANGER ZONE.
What it could be is that you value her friendship, but at the same time you have begun to develop feelings for her romantically. And you dont want to risk either.
The problem lies in that if she didn't see you as a potential partner from the start you have always been just a friend.
Sure there are a few times wjen friendship goes beyond, but tbose are rare. Most of the time you are pretty much set as one or the other, it takes a big event to remove the divisor between the two.
There is also the possibility that she was into you at the start and over time saw you weren't interested in more and just marked you as a pal, and she'll never be your gal.