The Love Island beauty was left heartbroken in April when she discovered the Blazin' Squad star had been sneaking off to have sex with another woman while they were on holiday together, with Gabby only finding out about the affair two months later.
And while four months have passed, Gabby admitted the thought of Marcel's cheating still makes her blood run cold – especially since she suspects she was intimate with him just hours after he was unfaithful.
Marcel had picked up the other woman after an argument led to Gabby making an early return to their hotel room.
She told new! magazine: "He came back to me that day. Ugh, it makes me feel sick, because we probably had sex the morning after. I hope he had a shower in between."
But Marcel dug the knife in further when he accused her of cheating with ex Towie star Dan Osborne in June, after pictured emerged of the pair on a yacht with friends.
She said: "All of a sudden Marcel is like, 'Someone told me you and Dan were shagging the whole time.' The first thing I said was, 'I can't even consider that you would think that's true!' Dan's married and his baby was about to be born."
Asked if she would ever consider a romantic relationship with the personal trainer in light of his split from Jacqueline Jossa, Gabby insisted she had no interest.
She slammed: "Oh my God, no! He's a f***ing joker since he's become single. I keep reading about him in the press. It's like, mate, sort it out. He's still married!"
Despite her disdain, Gabby will be forced to get up close and personal with Dan when they enter the Celebrity Big Brother house on Thursday night.
The Sun Online has exclusively revealed many of this year's big names including Roxanne Pallet, Ryan Thomas and Kirstie Alley.
The show’s "Eye of the Storm" theme is focused on redemption, and all of the celebrities will be asking viewers for forgiveness for past scandals.
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