Despite reports that Jennifer Lopez is “devastated” by her split with Marc Anthony, J. Lo’s confidantes say her soon-to-be-ex-husband was “very controlling” behind the scenes of her “American Idol” career. Friends of the couple say Anthony was known to turn up on the “Idol” set and make demands on her behalf. Meantime, according to unconfirmed reports, the split may have been the result of an affair J. Lo allegedly had with William Levy, dubbed “The Brad Pitt of Cuba.” But Levy flatly denied that he and Lopez had a relationship while filming her music video for “I’m Into You” in April. Lopez’s rep declined to comment.