Dr Alex George reportedly 'cheated on his ex' Ellie Hecht several times throughout the course of their relationship.
According to sources, the Love Island star was sexting a number of women before dumping Ellie.
"Alex cheated on Ellie very early on in their relationship but she chose to forgive him and move on," an insider told The Sun.
"She has really been his rock during a very difficult time for him and decided to give him the benefit of the doubt.
"Unfortunately, Alex went on to sext a number of other women during their relationship and it all came to a head when someone contacted Ellie and spilled the beans about what he had been up to."
Mirror have contacted Dr Alex's reps for comment.
According to the source, he claimed he 'hadn't slept with anyone else' but she struggled to believe him.
He ended their relationship earlier this year, a short time after the two bought a dog together.
She ended up having to leave with their dog and find a home to live in as soon as possible.
The news of him and Ellie calling time on their romance was revealed earlier this month.
The duo had been dating since January last year, with the A&E doctor confirming their relationship on social media in June.
A friend told The Sun : "Alex and Ellie tried everything to make it work but sometimes it's just not meant to be.
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"They have now gone their separate ways after a very emotional phone conversation.
"Ellie will be keeping Freddie and has moved her stuff out of Alex's new flat.
"It's heartbreaking for everyone and Alex is determined they stay friends."
Alex and Ellie have been through a lot together throughout their relationship, including the tragic loss of the frontline worker's little brother back in July.
Recently, Alex has been focusing on his health and fitness and has been inspiring his followers to do the same.
However, he had to call out a few fat shamers in one of his Instagram posts as he went to the gym.
Along with a shirtless photo, Alex penned that he is "not ashamed anymore" over how his physique has changed since appearing on Love Island with a six-pack.
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