Los Angeles: In an interview Robert Pattinson gave few months before girlfriend Kristen Stewart's brief fling with director Rupert Sanders came to light, the actor said he doesn't understand the concept of infidelity.

The "Twilight" star is yet to react after Stewart issued an apology for cheating on him, but his interview with the April issue of Italian Vanity Fair offers some clues.

When the magazine asked the British hunk whether he could ever date a married woman, Pattinson replied, "Life is not black and white. There are married couples that never see each other. Is that marriage?"

"But there's a thing I'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,"he added.

Before Stewart's scandal hit, friends had said that Pattinson was preparing to propose to her, reported a magazine.

"I'm not the casual-affair kind of guy. If I choose to be with someone, it's because I really want it. When I have a relationship, I'm 100 percent into it," he said in the interview.

Stewart, 22, was caught in several steamy make-out sessions with Sanders, her 41-year-old "Snow White and the Hunstman" director, who is married with two kids.


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