The strength of a marriage is directly related to its resiliency. Divorces come about for a number of reasons. Causes can be attributed to one or both parties. Isolated instances may damage or break the bond of marriage, whereas repeated instances can slowly chip away at a marriage until it crumbles. Sustaining a marriage requires trust, honesty, respect, patience, communication and sacrifice. When any of these are lacking or missing for a marriage, that marriage is in jeopardy of failing.
eHow Article: Common Reasons for Divorce