The Geordie Shore couple grew close again when Marnie returned to the MTV show during the 12th series, and the currently airing Big Birthday Battle.
They had been dating but the romance ended abruptly, with Marnie accusing Aaron of 'cheating' although he vehemently denied this. They did, however, clear the air ahead of the cast's trip to Magaluf to film series 13.
But writing in her weekly Star magazine column, Marnie said there was no chance of them ever reuniting.
"I'm definitely not getting back with Aaron. I don't trust him. He reached out to us and said he hated arguing so publicly, which made me feel better," she said.
"But I'm 100 per cent single. Before we came into the house, he said, 'If you dare get with someone I'll end up getting kicked off the show and that will be your fault.' He never apologises. It drives us insane."
Marnie, 24, added to The Sun Online that she's not looking for new romance just yet as she's so busy. She even confessed she hasn't had sex for three months.
"I was too busy – that's not out of choice, I swear," she said. "You don't get time these days to get to the nitty gritty do you? And at the end of the day, I'm not the type of person who goes and picks someone up and sleeps with them – I have to be with someone. And I haven't really got the time to be dating at the moment. It's hard."
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