Kelly- the title is:

The Solo Partner: Repairing Your Relationship on Your Own
by Phil Deluca.

Now it is out of print, but available used on Amazon. That is how I bought it about 3 weeks ago.....I found it by going to google and typing in the book's title and author, it links to amazon. When I went to Amazon first, I couldn't find it for some reason. It is a great book in my opinion...it will tell you a lot of things you perhaps already know, but I like the framework of the book. Very helpful. And there are worksheets in each chapter, so it is very solution focused which is in line with DBing.

Good luck!

C.