What stands out to me is that she was already in an committed 18 year relationship. She probably isn't ready to get into another committed relationship again yet. She sounds like she enjoyed having someone to talk to and vent to and mull over what direction she may take in her life, not sure what she really wanted.

You might have shared too much of your history, and what stands out to me is that you had an on and off relationship for 15 years, never married, never really fully committed? She heard this you know. And as you mentioned neither of you knew what you wanted either. I am wondering if you have a pattern you don't realize where you get attached, break away, get attached again and break away. Something to stop and think about that you might not realize about yourself.