Jesse James and Sandra Bullock Jesse James and Sandra Bullock

Jesse James' ex-wife says that the former Monster Garage star is a "chronic cheater."

"I feel sorry for Sandra [Bullock] because she was so in love with Jesse that she was blind and gullible," Janine Lindemulder tells In Touch. "She 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.'"

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Lindemulder, a former porn star, tells the magazine that James was unfaithful to her just weeks into their marriage, and though she tried to ignore it at first, it continued throughout the marriage.

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Lindemulder further claims that she and James had phone sex while he was dating Bullock, and that two weeks after he and Bullock got married, James called Lindemulder and said, "I want to come up to Oregon. I think I made a huge mistake."

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A TMZ report claims both Bullock and James are looking for divorce lawyers, but their reps tell People that this is untrue.

Neither Bullock nor James' reps immediately returned calls or emails for comment.