Sandra Bullock's boyfriend, Bryan Randall, is the actress' first real boyfriend that she flaunted in public after splitting with Jesse James in 2010. However, it looks like Randall's sincerity is now being questioned by people close to the actress. In the couple's early days of their dating, it was said that he was cheating on Sandra with his ex-girlfriend, Paris St. John.

Sandra's boyfriend is still seeing his former flame who's half his age while he's with Sandra, according to Movie News Guide. New reports claim that the photographer is actually not serious with the actress because he can't give up the young model.  He is reportedly cheating on the 51-year-old star, who's over the heels in love with him.

In August, St. John shared a photo of herself and Bryan on her Instagram account and even claimed that she was hooking up with him before Sandra came, Ok! Magazine reports.

"Bryan, 49, was dating his 23-year-old ex, Paris St. John, during the early days with Sandra - and may still be seeing her," a source told the site. "Bryan kept Paris in the picture as a backup plan. Now he's trying to cover his tracks."

There are even reports that say Sandra's boyfriend had an agreement with Paris to stay beyond the spotlight and claim that they already stopped talking. It was reportedly planned so Bryan could make his relationship with the popular actress the center of media's attention. Sandra's pals are reportedly worried about her because they think that he's just using her for fame.

"Bryan has struggled in his career and his private life, and now he's with a huge star," the source said. "It's not hard to see what the attraction is."

Meanwhile, amidst the cheating rumors, the Oscar-winning actress and Bryan were seen flaunting major PDAs during their date on Friday, Oct. 9, at Casa Vega Restaurant in L.A. The couple was seen together with Sandra's younger chef sister, Gesine Bullock-Prado, and singer Sia. As of late, it is said that Sandra's boyfriend has moved in with the actress in her seven-room mansion in Beverly Hills.

Do you think Sandra's boyfriend is cheating on the actress?