Sometimes, it seems like a divorce came from out of the blue. A seemingly happy couple calls it quits, and their friends and families are left shell-shocked. Obviously, whatever problems caused the divorce were apparent to the couple. It's hard for those not involved to imagine why a marriage breaks up, unless some of the obvious signs, like infidelity, abuse and other apparent issues, are present. Much of the time, breakups happen as a result of unexpected factors. Early in marriages, couples should tend to some of the following issues. A sudden change in lifestyle can be jarring for some individuals - learning to share everything, including their privacy, can be tough for those who haven't lived together. Having certain expectations and a level of understanding for the other partner can be difficult for those not used to sharing all aspects of their lives. If expectations aren't communicated, then it can create friction in the relationship.