She is looking at you as a back-up plan in case her marriage doesn't work out.
I wouldn't be surprised if she calls you again after another of her marriage breakdowns.....
Now it is up to you to decide if you want to be 2nd in line sucker or grow a backbone and get on with your life.
I would disagree on this. Its not the stereotypical datings tips and articles you read about, when it comes to real life and feelings, I wouldn't agree that his EX is doing anything like keeping him as a backup plan or whatever. Her problem would also be that like him 'TEETAR' she finds comfort in him by merely talking to him. When we are in love with someone they are not just romance flings, we do become attached and develop a close friendship and relationship, and we go back to find that close friend when we need them the most.
So, like I suggested earlier, maybe its time you have a clear heart to heart with her, and ask her to be honest with you regarding her present marriage and relationship with husband and if its not working out, maybe you will both find happiness together then.
This is a complicated world, and honestly, you dont really find someone that you feel so strongly for every now and then. Emotions are an investment, and once you invest them somewhere, don't chicken out, wait for it to come to fruitition. :biggthumb