Robert Pattinson took his relationship with Stewart very seriously and some have claimed he was even planning to propose.
In a rather telling recent interview with Italian Vanity Fair, he expressed his thoughts about cheating:
"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 told the magazine, later adding, "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."
