The Geordie Shore star, who finished fourth in this summer's CBB, struck up a romance with ex-TOWIE star Lewis in the house.
Lewis finished in tenth place.
Chatting to reporters including our colleagues Digital Spy over the weekend, Marnie, 24, admitted she was a tad concerned about how many ladies may try to chat up her man when he's doing personal appearances across the country.
"I am a little bit worried about that because I feel like a lot of girls these days just want to ruin stuff," said Marnie. "They just do it for that sake. But you can't live your life worrying about stuff like that."
Marnie couldn't stop gushing about how much Lewis, 26, means to her, and how much he looked after her in the house.
When asked how Lew compares to past boyfriends, she said: "He looks after us - really looks after us. If it wasn't for Lewis, I would have died of starvation. He cooked us three meals a day every day and he was just so caring and loving and I've never had anyone like that."
Now out of the house, both Marnie and Lewis have said they want to give their romance a go, even if they know there will be struggles, such as the fact Marnie lives in Newcastle and Lewis is based in Essex.
"Right now, I feel yeah, that we would be together for a long time because we get on so well," said Marnie.
"We don't argue, it's just perfect. We'll see."
The summer 2016 series of CBB was won by Stephen Bear, with Ricky Norwood and Renee Graziano finishing in second and third place respectively.
With thanks to our colleagues at Digital Spy.