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Sam Thompson split up with Zara McDermott last month after he discovered she "cheated" on him last year, according to reports.
The 28 year old reportedly found out that Zara, 23, had enjoyed a rendezvous with "someone in the music industry" when she took part in The X Factor: Celebrity last autumn,
Zara teamed up with her former Love Island co-stars Wes Nelson, Eyal Booker and Samira Mighty to compete on the show as part of group No Love Lost.
Zara McDermott shows 'ex Sam Thompson' what he's missing as she shares steamy snaps in crop top
Sam Thompson had been planning on proposing to Zara McDermott before 'split'
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A source said of her reported unfaithfulness: "Zara cheated on Sam with someone in the music industry. Someone connected to the X Factor.
"Sam is obviously distraught about this. He only found out about it very recently and has escaped for a few days.
"Zara regrets it and feels terrible. She knows it was a huge mistake and is extremely upset," the insider continued to tell Mail Online.
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The reports come after Sam's sister Louise Thompson posted cryptic tweets about infidelity earlier this week.
She wrote to her 519,000 followers: "Cheaters always want you to be loyal while they're being unfaithful," leaving her fans and followers to believe this was directed at her own relationship with fiancé Ryan Libbey.
A few days later she added another post, which read: "Trust takes years to build, seconds to break, and forever to repair" followed by "I'm proud of my heart. It's been played, stabbed, cheated, burned and broken… somehow still works."
It is now believed the tweets could be aimed at Zara and her relationship with Sam, not Louise's own romance with Ryan.
Zara and Sam's split was reported on Thursday afternoon, with a source once again telling Mail Online: "Zara and Sam split towards the end of last month.
"They had been arguing a lot since moving in together as a result of lockdown and things just built up between them.
Zara McDermott and Sam Thompson
Sam Thompson's sister Louise posts cryptic messages about 'trust' and 'cheating' before Zara McDermott 'split'
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"Zara has moved back to her parents' house in Essex where she's taking some time for herself, she really loved Sam so this hasn't been easy for her."
The source also made clear that Louise wasn't directing the posts at her own relationship with Ryan.
They added: "Things between Louise and Ryan are really great. Her tweet last week was actually aimed at a friend."
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