A woman point of view:
Cheating is the most intimate connection between a husband and wife. When a cheater gives that away, he can never take it back. It does something to a woman that kills something inside of her and leaves her feeling the rot. It is so painful, so unbearable, yet she is forced to swallow it. It is worse than death. It is taking the tier off the wedding cake and feeding it to a dog. Even though the cake is mostly there, and it is still sweet, she can never get that top tier back again. It is like being proud and feeling good that you are esteemed and respected high above the other layers, on cloud 9, only to learn that you are not and never will be again. A cheater puts aside his wife and helps a homewrecker to disrespect her by connecting with the evil woman giving her the power to join forces with him to destroy his wife in the most intimate way. She may think that you never truly loved her.
The wife may also lose her pledge of fidelity and feel prone to cheat without feeling guilty. Some women dare to do the unthinkable: let another man impregnate them in order to feel even and minimize the pain. In an effort to permanently protect herself against that kind of pain, she may not trust him again. These are not rational or sensible thoughts, but desperation brings about changes in people.
If a mate decides to cheat, he should weigh his possible losses, and be prepared to lose them. Many spouses walk away and never look back. Cheaters should stay single and not ruin another's life.