3.5? Trying to go back to all the books on my currently reading shelf I haven't reviewed so my Year in Review is accurate. :)
I liked Davis's How to Keep House While Drowning, in part because it recognized that not all people bring the same ability, energy, capability, to housekeeping. In this book, she brings that same nuance to relationships. Boundaries are a big topic, but they are often misunderstood as something we impose on others. Davis really centers the individual and their needs but also responsibilities in each case.
One thing I liked about this book was how it recognized that in the world of "Let Them" that is looking only at what you owe or can control yourself, the author also recognizes that we DO sometimes have responsibilities to others, and that there is a spectrum that those responsibilities fall within. Relationship expectations--and responsibilities--look different whether it's a stranger, a neighbor, a sibling, or a spouse. Davis also doesn't sidestep our responsibilities toward ourselves, and our need to also make sure we are meeting our own needs in a relationship. There is a lot of good stuff around people-pleasing.
For me, one of the best parts of this book were examples of patterns and relationship dynamics that exist when one person's personal trigger results in catastropic meaning making that results in a behavior that triggers the other person leading to their own meaning making and behaviors that keeps unhealthy cycles going. She also gives some ways to slow down and disrupt these cycles.
There is a lot of time devoted with a flow chart about disengaging from relationships as necessary that I'm sure would be more useful to others, but not particularly relevant for me.