Fans of CBB will remember that Stephanie had entered the house in January with a boyfriend (ex Sam Reece), before controversially falling for Jeremy McConnell. She split with Sam on her exit and went on to pursue a relationship with Jeremy.
Prior to her CBB debut, Marnie had been romantically linked to Aaron Chalmers, but she has insisted her situation is not the same as Steph's was. She is single.
Speaking to The Sun, Marnie explained: "Me and [Aaron] have been on and off for such a long time, we aren't solid. He's wished me all the best, but he can see the bigger picture."
"Stephanie was actually in a relationship with her boyfriend, they were quite serious," she added. "Me and [Aaron] aren't stable enough to not take that opportunity [to go in to CBB]."
Sam and Steph had been dating for a few years, and Steph had told her housemates she was planning to marry the First Dates star. Viewers, however, then saw their relationship break down as she grew close to Jeremy in the house.
Marnie has come under fire recently for her relationship with former TOWIE star Lewis Bloor in the house. Just days into the show, Marnie and Lewis have already struck up a romance and the pair have been seen kissing on numerous occasions onscreen.
Some Twitter users, however, have accused Marnie of 'cheating' on co-star Aaron. She and Aaron had sparked rumours they were dating again while filming for Geordie Shore's thirteenth series, after being photographed kissing and holding hands.
Aaron had referred to Marnie as his "wife" and seeing her CBB entrance, he tweeted at the time that he will be Marnie's "number one fan" while she is on the show.
Marnie, however, has made it clear that she and Aaron are 'single.' When quizzed about the romance rumours surrounding the dup, Marnie explained that she and Aaron "need to be single."
She then revealed that the pair had split up and got back together "four times" while filming because of trust issues.
Aaron, meanwhile, told fans he and Marnie are now "doing their own thing." One follower had tweeted him to say Marnie had 'cheated' by kissing Lewis, but Aaron insisted that hadn't been the case.
He said: "Me and Marnie are both single doing our own thing! I wish her all the best and hope she smashes it."
He has since appeared to rule out a future romance for himself and Marnie, hinting to fans that he is "still looking" for his perfect match...
Follow us on Twitter @RevealMag for all your celeb, fashion and beauty news!
Fancy winning some GREAT prizes? Check out Reveal Competitions here!