Tim Burton and Helena Bonham Carter reportedly split up a year ago

Tim Burton and Helena Bonham Carter announced the end of their 13-year relationship last week, but sources tell The New York Post that they’ve actually been living separate lives for more than a year and that both have had other lovers.

Burton, director of the new movie “Big Eyes,” and British actress Bonham Carter confirmed through a spokesman last Tuesday that they had “separated amicably” earlier this year and “have continued to be friends and co-parent their ¬children.”

The official confirmation of their split comes more than a year after Burton was pictured kissing and embracing a mystery blonde following a cinema date in North London in September 2013.

At the time, his representative denied he had been unfaithful, saying they were out with a group of friends.

But a source tells the newspaper: “Tim and Helena have been living separate lives for [more than] a year, and since they separated, they have both had other lovers. The separation announcement was made saying they’d split earlier this year, but they have been living apart for much longer.”

Despite some reports that Bonham Carter is despondent over the split, the source says, “Both parties are happy with the situation. It is perfectly amicable.”

The couple met on the set of 2001’s “Planet of the Apes” and worked on several other movies together including “Sweeney Todd” and “Alice in Wonderland.”

They were photographed in London on Christmas with their children, Billy Ray, 11, and Nell, 7. Reps for both Burton, 56, and Bonham Carter, 48, didn’t get back to the newspaper for comment.