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Jamie Lynn Spears and boyfriend Casey Aldridge have split, according to sources close to the couple, and the former Nickelodeon star is now moving on in a new relationship with Hammond, La., businessman James Watson.

"She's going through a lot of changes," says a Spears family friend. "It has been painful. She's a young mother and struggling in a lot of areas."

Spears moved out of the Liberty, Miss., house she shared Aldridge and their 19-month-old daughter, Maddie, about six weeks ago and is now living with her mother, Lynne, according to sources. The teenagers had planned to marry after Spears, then 16, became pregnant, gave birth to their daughter and set up house together. After a wreck last April that landed Aldridge in the ICU after he crashed his truck, a family source told PEOPLE that Aldridge was "thinking a little more seriously about things." Still, a wedding never materialized. (At least she doesn't have to give him any of her hard earned money. Would you get married if you saw how Kevin Federline cleaned up in his divorce from her sister.)

"She did a lot of growing up but he didn't," says a source. "I think she put up with more than she cared to put up with. She just got enough of it and was tired of the situation." (Doesn't that sound a lot like Maci and Ryan from MTV's Teen Moms. Just goes to show that all the money in the world doesn't make it much easier.)

Spears, 18, has recently begun dating Watson, 28, who owns a multimedia company close to Kentwood, La., according to a Spears family friend, who says, "he seems to be a nice guy."

Watson would not comment on his relationship with Spears when he spoke to PEOPLE. A rep for Spears has not commented on the status of their relationship nor her split from Aldridge.

Rather than stay in their former home alone, Aldridge is doing long-term construction work in another state, according to a source who spoke to him about the break-up.
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