The pair had a very rocky romance during the ITV2 series last summer, which has continued outside the villa.
But now it's said to be over for good between the pair.
"Olivia has been pushed to the limit by Chris. She's spent months putting up with him and his bad behaviour," a source told The Sun newspaper today.
"She's done with him. She's stuck by him throughout everything," they continued, "She is fed up now and feels completely used by him. She's told him it's all over and that's it."
Olivia hinted at the split in a now-deleted Twitter post.
She had written: "I think one of the worst feelings in life is being angry at yourself. Angry for the way i tried to see the good in someone when no one else did.
"I fell for the lies. I believed I was more than just a job."
The news comes ahead of the pair starring in their own reality show, to air on ITVBe from March.
Speaking about their show previously, Chris said “Liv and I have been through so much in our relationship in the last six months that it’s hard to remember what life was like before we met in the Love Island villa.
"I wouldn’t change any of it and I’m looking forward to going on this latest TV journey with her.”
Olivia added “Life with Chris is like one big rollercoaster but it’s safe to say we’re never boring.
"As anyone who saw us on Love Island knows, we can bicker hard but we love harder so I’m sure we’re all in for an eventful series!”
Chris & Olivia: Crackin’ On will air later in 2018.