Lindemulder has been engaged in a bitter months-long custody battle with James over their 6-year-old daughter, Sunny. James was awarded custody in December, but another hearing is scheduled for June, and Lindemulder's new husband reportedly believes that recent revelations about James could impact the case.
Lindemulder told In Touch magazine that James is a "chronic cheater."
"I feel sorry for Sandra because she was so in love with Jesse that she was blind and gullible," said Lindemulder, 41, who remains in a halfway house in Oregon after serving time for tax evasion."
"[Bullock] once said, 'I finally have a man who has my back.' And all I could think was, 'No, you have this man who does it behind your back,'" she said.
Lindemulder said James even continued to pursue her after he began dating Bullock. She rebuffed his advances but said she had phone sex with him.
"His famous line was, 'Tell me something nice,'" she said. "He would say he'd had a rough day and wanted you to tell him something nice. It was hard to say no to the guy."
US Weekly said James' infidelity was an open secret at West Coast Choppers.
An unnamed source told the magazine that the reality star would regularly post Internet ads searching for women. Another source added, "He sees their photos, answers the ads and invites the girls to his office."
Apparently, Bullock remained in the dark until now. "He is a whole other person when they're together," a source told US.