Cawthorn's communication director, Luke Ball, tweeted Wednesday night that the change in their lives since the election "has been hectic and difficult".
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"Together, we realized that balance was not attainable, and that we had irreconcilable differences between us," the tweet reads.
The 26-year-old ally of former President Donald Trump married Bayardelle, an Instagram fitness influencer, in April 2021.
He has asked for privacy at this time.
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Cawthorn is planning to switch districts and is running for a seat in the newly drawn District 13.
He was first elected to Congress in a June 2020 runoff election, representing North Carolina's 11th Congressional District, and became the youngest Republican to win a House seat.