Infidelity

Fidelity
Once you commit to marriage, you also commit to several other things, one of them being fidelity. However, the breaking of this commitment is one of the most publicized and well-known acts. It seems that you cannot go anywhere without hearing or reading about how so-and-so cheated on so-and-so. Infidelity is so common-place that many marriages start out with the plan that their marriage won't last at all.
Causes of Infidelity
Obviously you don't wake up one morning and decide to cheat on your spouse. Like with anything bad or evil, it starts gradual. It could be a friend or a coworker, or just about anyone it seems. First you just start talking, and then talking turns into meeting up with them and having lunch, and then lunch turns into more phone calls, and more ways to meet up, and then you start telling this person about your hopes and dreams, and then you start comparing them to your spouse, and soon you've placed yourself in a compromising situation where you feel uncomfortable sharing this all with your spouse because you know how it looks, and it looks and is wrong.
Boundaries to Help Prevent Infidelity
The only sure-way to prevent infidelity is to set boundaries with your spouse. Should you ever be alone with a member of the opposite sex? Should you seek out to talk to friends of the opposite sex? What about friends of the same gender? Coworkers? Church friends and leaders? What will you do when you are placed in a compromising situation? Spouses need to talk with each other consistently to make sure that their marriage is being protected and remains secure.