I do not know if past is accurate. People choose to get through it. I understand you think of her as a spouse and your feelings are valid. I would take the time to evaluate if you want to change something about yourself. As far as DB, I think you have pretty much acted as if apart from the anger and lack of validation.
Given the history and the lack of permanent ties (kids) take time to evaluate if you really think she is in place to change and be open with you. In other words is it she is familar and the unknown is a little "scary". Figure out what you want. I understand, please do not take this as diminishing the value of your relationship, every one is unique and special.
Married:10 years D final 8/28/08 10 minutes is all it took Life goes on and DB was no small part in growing from the Divorce!