The duo, who are parents to three-year-old True, have been co-parenting and seeing each other a couple of times a week but are no longer romantically involved with one another.
Kardashian was committed to making the relationship work when the couple rekindled their romance following cheating rumours.
As more speculation around his loyalty has arisen, a source confirms to E! News that they have broken up “very recently”.
“They had been working through the cheating rumours for the last couple of weeks, but Khloe told Tristan he lost all of her trust and the relationship could not be repaired, the insider shares, “Khloe really tried, but ultimately, felt too betrayed by him. She’s done and says she will not go back.”
The 36-year-old shared a snap to Instagram with a motivational yet somewhat cryptic caption “I will not lose, for even in defeat, there’s a valuable lesson learned, so it evens up for me”.
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Hours following the news of the split, Daily Mail report that Thompson was spotted at a party looking “disheveled” after disappearing into a room with three girls.
It has been confirmed by a source that he attended the party. Another eyewitness claims the NBA star was telling party-goers that he is now single.
Both Kardashian and Thompson are yet to confirm the separation.
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