Break Free is an okay book...I have found some of these very enlightening.
Divorce Remedy
Divorce Busting
Codependent No More (MUST READ FOR ALL DBers!!)
Make up Not Break Up (great for insight on why you breakup as well as pursuing/distancing and why we do it...etc)
His Needs/Her Needs
Good Mood Therapy (mandatory reading for any of us going through the anxiet/depression due to infidelity)
Again NYS hit it on the nose, smart cookie, there is not too much that you can do when you have a WAS...as he told me once and I believe him now...they don't want an R with you at this time...so really there is not too much you can do but to let their R die its natural death, assuming that it does.
That's why it is sooo important to focus on YOU..the LBS. Learning and rediscovering who you are...call it a mini vacation from all the madness of the merry go round that we are riding on. Read all you can about improving communication, relationships. etc...this way you have all the knowledge when/if your partner decides to work on the R.
The key is to draw them back to you...this as we know is not done by pursuing and begging but by becoming the more attractive grand prize so to speak...