The see-saw that you described will likely recur a dozen times if you continue to see her. First she'll like you near then want nothing to do with you then back again to liking you. I think what is most important is keeping yourself level. No matter what mood she is in you need to be happy, confident, put-together, and let her be back and forth. Focusing on how you conduct yourself and not on how she's behaving, thinking, or saying will allow you to stay balanced. Tman, we have all passed the point of playing games. Honestly, I think it will take more than subtle signs on her part to get you back. She's got the obligation to open her mouth and say some words that indicate a wish to try again. Anything else is just the usual WAW gobbledigook.
Think of your XW as a woman that is completely unobtainable (you know, like a much younger woman, a woman already dating someone, a coworker). The most you likely would do in that scenario is talk, potentially flirt a bit. But once you introduced yourself and showed the person you are, the onus of forming a relationship is entirely up to her. You have to see a major sign before picking up the ball. That's where you are at...live your own life the best way you know how. She knows you well enough to be less than subtle if she wants you.
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt
