Why don't marriages last anymore? Marriage used to be something normal with little to no divorce between couples. First comes love, then comes marriage, then comes the crushing realization that, sheesh, happily-ever-after takes a lot of work. A few years into marriage, many couples find their relationship faltering. Nearly 20 percent of married couples divorce within the first five years — but this is not to say that mutual affection doesn’t exist between couples who find themselves in a failed marriage. The causes of divorce are varied and complex, but the top reasons for divorce tend to fall across common themes. According to those who have a front seat to many a marriage’s demise — counselors, divorce lawyers, and therapists — certain patterns emerge. Here are seven of the top reasons for divorce, straight from the experts.