Paul David Tripp has written a great book on marriage. Sub title Redeeming the realities of marriage. It covers six commitments with two chapters per Commitment. The commitments include confession & forgiveness, daily growth and change, building a sturdy bond of trust, building a relationship of love, dealing with differences & appreciation with grace, and working to protect your marriage.
In my counseling ministry I have worked through the book several times and am now in the process of helping my client couples to go through chapter by chapter using a simple study outline to rebuild their marriages. I highly recommend it because I have seen dramatic change happen.