Knew I was waiting for an update, eh?
I have several comments -
The optimist in me - WHOOOOOOO WHOOOOOO
In my mind the ex has shown what a loser he is because it sounds like that was a very clear tactic to make her jealouse and make her come crawling back to him. He thinks her self-esteem is sooooo damaged that the thought of losing him will bring her around. (If everything in fact went down as she said it did.)
I think you are doing the right thing to not make any promises that you don't feel comfortable in making at this time. Bask in the glow of her company for as long as you can - see how things evolve, and make sure you keep your friends up to date.
High Hopes for the Future!
Jules