Keira Knightley and Rupert Friend Split

Keira Knightley and Rupert Friend Break Up
Keira Knightley and Rupert Friend
Richard Young/Startraks

updated 01/13/2011 AT 09:35 AM EST

originally published 01/13/2011 AT 08:50 AM EST

Keira Knightley and Rupert Friend, whose work together on 2005's Pride & Prejudice led to a long off-screen relationship, have split up.

A source tells PEOPLE that the couple, who had shared a London home overlooking Hyde Park, quietly broke up a few months ago, shortly after Knightley bought a house in the South of France, outside Nice.

Distance and career "were both considerations," the source says. "It was time for her to move on."

Will Knightley, Keira's father, tells the British tabloid the Sun: "They were together for quite a long time, and it is always hard breaking up. She's focused on her work."

Knightley, 25, is best known for playing Elizabeth Swann in the Pirates of the Caribbean movies. Friend, 29, played Prince Albert in 2009's The Young Victoria.

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