Amanda Seyfried, Dominic Cooper "On a Break"

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Amanda Seyfried and Dominic Cooper are "on a break," a source tells

The couple -- who began dating about three years ago -- have not officially split.

"They have been on and off for a long time," the source tells Us. "Right now, they are taking some space from each other."

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But the source insists, "There is no drama. They are just on a break."

Seyfried, 24, recently told Teen Vogue she wasn't sure if Cooper was "The One."

"Too much planning can lead to heartbreak," she says. "Love is great and possible always, but it's very rare to have the feeling that 'I want to be with this person forever.'"