Why We Cheat

If you've ever been in a relationship, the thought of cheating has crossed your mind. It's one thing to think something though, and quite another to do it. But why do we do it? It's a question as old as relationships themselves. No doubt, at some point  either you've cheated, or been cheated on. More than likely, you've experienced both sides of that coin. Some people cheat because they were cheated on first. Some do it because they assume that their mate has been doing it. Some adopt the attitude of "fuck it, why not? They'll never know." Which is actually pretty damn true. The vast majority of people never know that they've been a victim of infidelity. Which leads to the question, would you rather know your partner is out getting their groove on, or would you rather be in the dark about it? After all, ignorance sometimes truly is bliss.
While I'm on the topic, in a relationship what exactly is considered cheating? I think it's doing anything intimate or sexual with someone other than the person you're in a relationship with. But I've heard answers that run the gamut,  from texting to only sex, and everything in between. I suppose that depends on the person. It seems that it's less about the how, and more about the why. How can it be that you love someone, but still cheat on them? How can you sleep next to someone every night, yet be carrying on a secret affair? What about if you have a child with that person?
Temptation is everywhere, especially if you're a reasonably attractive person. Let's face it, when opportunities are abound, staying faithful can be cock-smashingly hard. Pair that temptation with the fact that things may not be going ideally in your current relationship, and the grass on the other side starts to look mighty green. What began as a shoulder to cry on, can quickly turn into late night text message confessionals. A lot of bad deeds start out with good intentions, so save yourself the trouble. Don't cheat. But if you must do it, don't get caught.