She and James starred on the fourth series of Ex On The Beach that aired earlier this year, and it's safe to say they didn't end their relationship on good terms.
Viewers watched Olivia struggle to live with James and move on from their split, while he happily pursued a romance with co-star Ashleigh Defty. Following the show, though, Olivia and James had appeared friendly on social media - sparking speculation they could be getting back together. BUT, according to Olivia, that is definitely not going to happen.
Speaking to the Daily Star, Olivia said: "[James] is just not worth the hassle. I know he wants me back, but we just couldn't. Far too much has gone on."
She added: "The sex was really, really good - that was probably one of the things that kept us together for so long. There used to be a lot of make up sex, but not now. I wouldn't sleep with him anymore."
Olivia and James had previously dated for three years and had even shared a house together. On Ex On The Beach, James admitted he split with Olivia because he "got bored of her."
He found himself clashing with Olivia on several occasions on the show. She called him out for being disrespectful, after he was seen being all over Ashleigh in front of her. That led to James also clashing with his co-stars (especially Lewis Good) for the way he spoke to Olivia.
While James had made things official with Ashleigh during his time in the villa, things between them didn't work out. When the series wrapped, Olivia said she finally saw "what an idiot" James is, so fans were surprised to see them getting on with each other on Twitter back in March.
They had been on joint PAs across the country and even tweeted about a road trip they were planning for one of them. Many fans then questioned whether their friendliness was because they had got back together, but Olivia made sure to set the record straight.
At the time, she tweeted: "Me and James are NOT together and never will be! That chapter is totally done, I have never met a NASTIER piece of s**t in my life."
James, meanwhile, said: "We were just on a joint PA guys. Not back together! I don't go backwards I go forward." Although, he did include the hashtag "#besties."
Since then, Olivia and James have admitted they have a "love/hate relationship" - hence the constant banter between them on Twitter.
For example, James couldn't resist making a dig at his ex when she asked for advice on her hair. Olivia asked fans whether she should lighten her locks or stay dark, while James suggested she should completely cover her face, instead. Nice.
He tweeted: "@oliviachristina Id grow a long fringe past your chin..."
She replied: "You should take your own advice."
Oh, you guys.
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