The reality star, 28, went on to claim he wants to have children with his former lover.
Stephen told MailOnline: "I cheated on Ellie with somebody else and she found out about it. We were going through a hard time, always arguing. It wasn't nice at the end."
He added: "We needed to break away and then we had broken up and got back together.
"Then I went away filming and it looked like I got together with someone in LA, but I didn't."
Stephen's claims come after he shared an image of the pair during happier times on his social media.
He captioned the candid shot: "If I could rewind the clock I would have done so many things different. Me at my happiest."
Despite the heartbreak, the former Celebrity Big Brother star has vowed to reignite the flames of romance as he plans a family with his ex girlfriend.
Stephen claimed: "I'm in a better frame of mind now and I need to work on myself a little bit and hopefully I can prove myself to her.
"I don't want no one else. I want to have kids with her and no one else. I just need to prove myself."
It seems like Stephen will stay true to his word after declaring a party ban via his social media account.
Sharing a caption on his Instagram story, Stephen put: "Going ghost from bars and clubs for a while. Need to wake up."
The Sun's Bizarre column revealed in April that Stephen had moved on from his ex Charlotte Crosby with Instagram star Ellie – just four months after their bitter split.
A source said at the time: “Stephen and Ellie have been together for a number of weeks now but have only just started to let people know about their relationship.
They added: "Stephen has been involved with a few girls since his split from Charlotte but no one has held his attention quite like Ellie."
However, after a rocky few months of breakups and makeups, the pair's relationship came to an end when Bear met Georgia Harrison.
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