This is the monster that consumes us. Every conversation we have with S, we start to imagine everything from what they said, to what they did not say, to how they said it. It will drive you straight through your own head. Impossible and I am king, but you cannot read into EVERY conversation you have. Do what you are comfortable with and do not push, pursue, etc. I hear it in your conversations with her. Do not call all the time. I know the temptation is strong, especially when you feel like you had a good exchange.
Back up and slow down or you will drive yourself over the edge.