Infidelity

What is infidelity? According to Webster, it is the "quality of being unfaithful". My question is, why do people resort to cheating? All it does is create a larger tension and pain for both parties. If you feel like you have to cheat, then don't be in a committed relationship. And if you're already in one, be honest with the other party that you no longer have feelings for them. It will hurt much less than them finding out later on that you were with another (other) girl(s). Also, in the act of being unfaithful, do yourself a favor and try not to procreate. When you already have children with other women that you don't fully take care of, why are you going to create more?!