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"Robert Pattinson said that he does not &amp;quot;understand&amp;quot; why people would want to cheat in an interview published shortly before girlfriend Kristen Stewart&amp;#039;s fling with Rupert Sanders.  Stewart admitted to having an affair with her married Snow White and the Huntsman director yesterday (July 25), releasing a statement in which she apologised for &amp;quot;the hurt and embarrassment&amp;quot; caused to Pattinson by her &amp;quot;momentary indiscretion&amp;quot;.  Speaking in the April edition of Italy&amp;#039;s Vanity Fair, Pattinson declared that he is &amp;quot;not the casual-affair kind of guy&amp;quot; and wouldn&amp;#039;t ever give in to temptation while in a relationship. Asked if he would date a married woman, the Twilight actor replied: &amp;quot;Life is not black and white. There are married couples that never see each other. Is that marriage? &amp;quot;But there&amp;#039;s a thing I&amp;#039;ve never got: That is, why do people cheat? I can understand the impulse, but not how you can keep two relationships going at the same time for long.&amp;quot;   He continued: &amp;quot;I&amp;#039;m not the casual-affair kind of guy. If I choose to be with someone, it&amp;#039;s because I really want it. When I have a relationship, I&amp;#039;m 100% into it.&amp;quot; Pattinson is said to have discovered about Stewart&amp;#039;s fling late last week and has been left &amp;quot;miserable, heartbroken and humiliated&amp;quot; by her betrayal. Sanders, who has two children with wife Liberty Ross, also released a statement yesterday saying that he is &amp;quot;utterly distraught&amp;quot; to have hurt his loved ones.   Ross gave an interview of her own just two weeks before Sanders&amp;#039;s affair in which she described her marriage as &amp;quot;amazing&amp;quot;. On relocating to Los Angeles from London with Sanders, she told You Magazine: &amp;quot;Moving here and starting a life all over again was a lot harder than I had anticipated. &amp;quot;But that&amp;#039;s why everything feels so amazing now. We rode through the really hard times and we stuck it out.&amp;quot; Photo gallery - Robert Pattinson and Kristen Stewart&amp;#039;s relationship in pictures:  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/showbiz/kristen-stewart-and-robert-pattinson/news/a395496/robert-pattinson-asked-why-do-people-cheat-before-stewart-fling/>