Jennifer Lopez has become a “fitness robot” who is obsessed with her body, and it caused problems in her relationship with boyfriend Casper Smart, RadarOnline.com has exclusively learned. 
 
 Lopez, 44, recently broke up with Smart, 26, in the wake of embarrassing allegations that he had “sexted” transgender model Sofie Vissa. 
 
 PHOTOS: JLo’s Boyfriend Isn’t The Only One! 10 Celebrities Who’ve Been Caught Up In Transsexual Scandals! 
 
 But now a source is telling Radar that Lopez’s body issues also played a role in the two drifting apart. 
 
 “Jennifer’s obsession with her own body is out of control,” the source said. “There’s no doubt she’s worked herself into the ground to achieve her killer shape.” 
 
 PHOTOS: Busted . . . BIG TIME! 12 Hollywood Stars Caught On Camera Cheating! 
 
 Although Lopez is hailed as an incredibly fit forty-something, the source revealed her focus on fitness has affected those around her, especially Smart. 
 
 “In the end, Jen and Casper had nothing else to talk about except diet and exercise stuff, and that was exactly how she wanted it,” the source said. 
 
 PHOTOS: Cheating, Gay Lovers, Incest, Drugs & Lip Synching! 50 Of Hollywood’s Juiciest Confessions 
 
 Lopez’s trainer, Tracy Anderson, recently told Allure Magazine that the single mom of twins follows a portion-controlled diet and participates in rigorous 90-minute workouts. 
 
 The singer and American Idol judge told British Glamour Magazine herself earlier this year, “I’ve worked out my whole life and I’ve been incredibly disciplined when I needed to be.” 
 
 Although Lopez said she sometimes wants to relax in a beach chair, she motivates herself to do otherwise. 
 
 “At the same time that very ambitious, determined girl inside me is like, ‘Come on, let’s be in the best shape ever and really show everybody.’” 
 
 PHOTOS: Behind-The-Scenes Exclusive! 35 Scandals & Secrets From The Set Of American Idol 
 
 The source noted, “Jen obviously looks great, but she has become a health and fitness bore and it’s driving those close to her nuts.” 
 
 “It’s no exaggeration to say that Jen is obsessed with her body and, other than her kids, nothing else comes even close to being as important to her as staying in shape. 
 
 PHOTOS: Jennifer Lopez Star Style Evolution 
 
 “Jennifer used to love talking about fashion and movies with her girlfriends, but now it’s ‘this cleanse,’ ‘that workout routine.’ She’s like a fitness robot who has nothing else in her life!” ||||| Days after a source told us that Jennifer Lopez‘s two-and-a-half year relationship with Casper Smart has been “all but over�? for some time, new reports indicate the superstar’s affair with the backup dancer drew to a close nearly two months ago. 
 
 According to online reports, the scandal-plagued couple have been finished since April, quietly calling it quits in a cordial parting of the ways. 
 
 Busted . . . BIG TIME! 12 Hollywood Stars Caught On Camera Cheating 
 
 The break-up was not directly connected to Smart’s alleged recent communications with multiple transexual models via Instagram, according to reports, which stated that Smart has been removing his belongings from Lopez’s home as she tours in promotion of her upcoming album. 
 
 As we previously reported, a source close to the dancer, 27, told Radar that relations between the two had been strained with the “On The Floor�? singer, 44, prior to the recent humiliation over his online shenanigans, as she kept him sidelined as her promotional tour hit her native New York. 
 
 They Sell Sex For Fortune & Fame — 11 Star$ Who Gained Big Bucks From Selling It 
 
 The source said, dovetailing with the latest reports, that Lopez had essentially been wrapping things up with Smart prior to the scandal, removing him from his creative director position in her organization. 
 
 “He was basically demoted to her cabana boy.�? 
 
 PHOTOS: Jennifer Lopez Star Style Evolution 
 
 Last October, a source told us that the Selena star knew “the spark [was] gone�? in the romance, and “that this thing with Casper [wasn’t] forever. 
 
 “She’s having a hard time ignoring the fact that her head has been telling her for a while and now her heart’s saying the same thing,�? the source told us at the time. 
 
 PHOTOS: Cheating, Gay Lovers, Incest, Drugs & Lip Synching! 50 Of Hollywood’s Juiciest Confessions 
 
 In the meantime, one of the transsexual women Smart had allegedly exchanged messages with, Sofie Vissa, continues to attract attention for her involvement in the fiasco, with Vivid Video extending an offer to the 23-year-old bikini model for a sex tape to cash in on her 15 minutes of fame. 
 
 “We don’t normally do transsexual celebrity tapes,�? Vivid founder Steve Hirsch wrote, “but in your case we just might make an exception.”
– We knew things were not looking good between Jennifer Lopez and Casper Smart, and last week the world discovered they are, in fact, over. But, though rumors have flown that the breakup had something to do with Smart's interest in transsexual models, sources tell Radar the truth is a little more mundane. J.Lo is simply "obsessed with her body," a source explains, and has become a "fitness robot" who reportedly sticks to a regimen of 90-minute workouts. She and Smart "had nothing else to talk about except diet and exercise stuff," the source says. "She has become a health and fitness bore. ... It's 'this cleanse,' 'that workout routine,'" all the time. (Click to read about 7 unusual celebrity workouts.)