<p> </p><p>Word on the street is actress Natalie Portman is keeping quiet over her relationship with choreographer Benjamin Millepied because she doesn’t want to be projected as a home wrecker. Millepied, 32— A New York City Ballet dancer, is choreographing Natalie in her new movie The Black Swan.</p><p>Reports suggest that Natalie was the reason behind Millepied’s break up with his girlfriend of three years. “They’ve been dating since the fall, all the while he HAD A LIVE-IN girlfriend!</p><p>“But the real reason she was quiet about things is that Ben had a live-in girlfriend of three years when they met. Ben’s girlfriend was a ballerina at the American Ballet Theater. She had been talking about marrying him and was very blindsided by the split. She moved out right after New Year’s Eve,” added the source.</p><p> </p>