The chat aired in tonight's live eviction show, although was pre-recorded earlier in the evening.
It was announced on Saturday morning that Roxanne had quit Celebrity Big Brother after two weeks inside the house.
A spokesperson for Roxanne said: "Roxanne decided to leave the CBB house late last night after deliberating for two days with some sensitive issues she felt strongly about. She has now been reunited with her fiancé and family and thanks everyone for their support during her time in the show."
Roxanne left in the wake of a clash with Ryan Thomas. Things kicked off last week after a controversial 'altercation' between the pair last week. Ryan was given a warning by Big Brother for 'unwanted physical contact' after Roxanne complained that he had been 'violent' towards her.
However the vast majority of viewers felt Roxanne overreacted to Ryan's play fighting, with many even calling for her to be removed from the house. Ofcom received more than 25,000 complaints about the incident.
In Saturday's show, the other housemates got involved in Ryan and Roxy's feud as Ryan hit back at the claims Roxy had made against him.
Later on, the live eviction saw Ben Jardine exit and Roxanne booed by the crowd. Roxanne retreated to the Diary Room and asked to leave the house.
Appearing on tonight's episode with host Emma, Roxanne said: "Watching it feels like a completely different scenario to how it felt at the time.
"How it felt when he did it, it hurt. I can't prove a feeling. I convinced myself he meant to do it, and when I watched it back I immediately realised... I'm more shocked at myself than anyone out there is."
She went on: "I feel devastated. It cripples me with embarrassment and shame that I could have put someone in that position. Seeing the footage of Ryan in the Diary Room distressed.
"I got it wrong. I can't apologise enough... all I can do is apologise and got it so wrong.
"I'm the most hated girl in Britain right now. It's the title I feel everyone has given me right now. All I can do is own it, accept it and apologise.
"I got it wrong, and I'm human and I made a massive, massive mistake."
"When I watched that footage back when I left the house, which is the first thing I did... I got it wrong, I got it really wrong," she announced.
Roxanne concluded: "I absolutely overreacted, I was out of order and I got it wrong. I massively regret it.
"I've had to take a massive step back but I don't blame everyone. If I was watching this I would've been confused by my reaction. I apologise massively to everyone I offended."
Celebrity Big Brother 2018 airs nightly on Channel 5.