The author ponders different forms of "stuckness" - habits, addictions, traumatic memories, relationships, jobs. Her writing style was interesting and often engaging, but sometimes she came across as just a little bit "judgey," though it also seemed she was trying very hard to give balanced discussions and avoid coming across as judgmental. In the chapter on habits and addictions, she is skeptical of the model of addiction as disease and searchingly questions the claim that people sometimes have limited control over these things. Same thing in the chapter on trauma.
I was particularly bothered by the chapter on relationships. She emphasizes that she herself is happy in a long-term relationship, and devotes a lot of attention to defending people in happy long-term relationships against the suggestion that they might be stuck just by virtue of being in a happy long-term relationship. She goes through all the arguments about how stable long-term relationships are better for society generally, and for children, and for the people in them, and seems to imply that the main alternative to this view is the modern fad of praising sluttiness and sexual promiscuity. For her, being in favor of sexual autonomy seems to automatically mean being against stable long-term relationships and in favor of promiscuity. To me that is a false dichotomy.
Over the years I've come to have less and less positive views of marriage as an institution - one reason is because of its millenia-long history as a form of non-consensual sex work and a tool of patriarchal oppression. I feel like a society that makes it possible for women to be fully realized human beings would be one that supports as much as possible women having financial and sexual autonomy. But autonomy doesn't automatically mean a rejection of long-term relationships, it just means that women (and men) would only be in long-term relationships because they want to be in them, as opposed to being in them because society decides that people ought to be and stay married, or because things like divorce and singledom and shorter-term relationships are stigmatized.
Another reason is that I think if you genuinely love someone in an unselfish way, you want that person to be as free as possible, even if it means they're free to leave you, in fact, especially then. Binding yourself and the other person to a life-long commitment through the institution of marriage is doing the opposite, making it harder for the other person to leave you if they eventually find they want to (and thereby causing them to experience "stuckness"!). So, in that sense, marriage doesn't seem like an expression of love to me. Basically, though, I have no issue at all with happy long-term couples who stay together for good reasons, like that they enjoy each other's company and make each other's lives better and they can flourish as human beings in the relationship. I just have issues with unhappy couples feeling pressured to stay in couplehood for bad reasons. So I really get annoyed by arguments that long-term couplehood is intrinsically superior to singledom, and I felt like she was doing that. Meh!