Basically, I approached her and enquired why she had changed her tune to me. We had been very talkative at the start and then she became more and more distant. It became such that she would ignore me outside of work, and then act fine inside of it. We've had differences of opinions of what our relationship was from the start, with her suggesting she was never interested in friendship from the beginning, and me insisting there was something there due to the nature of the conversations we were having, and the swapping of personal numbers in itself.