Britney Spears' little sister dumped her longtime boyfriend by phone - because she couldn't live without him. Teenager Jamie Lynn Spears ended her romance with Casey Aldridge after he started college in Mississippi because she reportedly feared he'd cheat on her with other students. Aldridge, 18, spent the summer with Spears in Los Angeles, where the couple were rarely apart - and the young actress couldn't bear it when he left her to concentrate on his studies. But the 16 year old wasn't nursing a broken heart for long. A source says, "She's seeing a new guy."