The duo, who reunited in September 2012 after briefly dating and breaking up in 2007, recently decided to end their romance due to their conflicting busy schedules.
A source told Us Weekly magazine: ''It didn't make sense for them to be together right now.''
The 33-year-old actress, who previously dated Derek Jeter and Jake Gyllenhaal, is currently shooting the TV series 'Almost Human' in Vancouver, Canada, while Chris, 32, is gearing up to direct the movie '1:30 Train' in New York City.
But it seems the pair could reunite in the future when long distance is no longer a factor.
The source said the former couple, who were all over each other at a Beyonce concert in Los Angeles in July, are on good terms and are ''still care about each other.''
A friend previously revealed that they had been trying to take their relationship slowly because 'The Avengers' star Chris, who was previously linked to Jessica Biel, was hurt when Minka suddenly ended their romance six years ago.
The insider said: ''She did a number on him back then. But she reached out to Chris this time. He's still a little insecure, so he's being cautious.''
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