Here is a preview and overview of one of the best books on marriage I have read: What Did You Expect?. In this video, the author, Paul Tripp, introduces the root of almost any marriage conflict or emotional distancing: The heart.
This is not a book I recommend for pre-marital counseling – not that it would be a bad thing. There are many other good ones for those prepping for marriage. But I do wholeheartedly recommend this book to those who have been married for any length of time, no matter how strong or how strained the marriage is.