The 'Atonement' beauty hopes committing to buying a house will help cement their relationship, after their busy schedules have kept them apart recently.
Keira is also said to be worried about Rupert's budding friendship with his 'Buddha's Little Finger' co-star Sophia Myles.
A friend said: "They have been arguing about Rupert's workload and how little time they spend together. Keira was quite concerned they were drifting apart and was also worried he was getting a bit too close to Sophia."
"So she flew to the set in Germany and they sorted things out. It was then that they decided to buy a house together and they are going to put in Å1 million each (approximately $2 million)."
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