The reality star has predicted the revelation will cause trouble in Essex (well, at least among the 'TOWIE' gang) as the show returns for its 11th series.
The revelation will be printed in his autobiography Living It Arg, out next month.
Fans of 'The Only Way Is Essex' have watched as Arg's turbulent romances have fallen apart in previous series.
We saw him cheat on first love Lydia, followed by a rocky brief romance with co-star Gemma Collins.
Last year he told Reveal mag: "I can't expect Lydia to say nice things about me really because I did put her through sh*t, and she's always going to be angry and hate me for what I did to her, regardless of what I'm like now.
"I was very young at the time, I didn't cope too well with the fame, it all went to my head a little bit and I made a few mistakes.
"Gemma's a lovely girl, she's one of my friends but she's another one who needs to maybe move on!
"It's just obvious Lydia is very hurt and upset and didn't have anything nice to say - but she needs to move on and find someone else now. It's the same with Gemma, she needs to move on too because I don't really slag either of them off."
Gosh, what a charmer.