Kelly Clarkson Will Make Sure Her Children Grow Up in a 'Stable, Loving Environment,' Says Source

Kelly Clarkson Files for Divorce from Husband Brandon Blackstock After Nearly 7 Years of Marriage

Another source previously told PEOPLE that Clarkson and Blackstock have "been like friends for a while," and work demands put a strain on their relationship.

"Things had changed in their marriage and the split was a while coming," says the insider. "They both work so hard. It's nearly impossible to enjoy each other, especially with the children needing constant attention."

For all the details of Kelly Clarkson and Brandon Blackstock's shocking split, pick up the latest issue of PEOPLE, on newsstands Friday.

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