Hot topic: Kristin Stewart affair

So Kristin Stewart had an affair with her Snow White and the Huntsman director Rupert Sanders. Sanders is married and has two children, and as you all would know, Kristin is dating Robert Pattinson. I have seen many reports and articles about the affair, and an array of comments, ranging from words of support and understanding, to those of disgust. So what are your views? Personally,  both Kristin and Rupert are adults and knew what they were getting themselves into. And they made the decision to cheat on their respective spouses. And as for the subject of cheating, I don't get it. If you are happy with someone, you will not cheat. If you are unhappy, and care about the person you are with, and you respect them, you WILL speak to them about it, and not turn to infidelity.