According to Star Magazine, the 19-year-old was frustrated by her beau's lack of commitment and thought he was immature, despite being nearly ten years her senior.
A source said: "After all the drama she'd been involved in with [her previous boyfriend], she liked the fact that James was a fun-loving, happy-go-lucky guy who didn't care that she was a celebrity. But as Jamie Lynn became more attached to him, his lack of seriousness about their relationship began to wear on her."
James, who has been described as "equal parts playboy and good ol' boy", eventually lost favour with Spears.
"The same thing that attracted Jamie Lynn to James at first is what ultimately turned her off."
