She said the Coronation Star punched her several times, however Ryan told he meant no harm and apologised.
"She has now been reunited with her fiance and family and thanks everyone for their support during her time in the show".
Celebrity Big Brother has seen a lot of drama this year, but nothing's come close to the tension between Ryan, 34, and Roxanne, 35, over the punching incident. She tells him she's got a little towel for him and he begins playfully dancing around her and jabbing at her arm.
The accusation came after another actor, Tracy Beaker star Connor Byrne, claimed that Roxanne had falsely accused him of violence in the past.
Asked by Kirstie Alley whether she thinks that Ryan meant to hurt her, Roxanne claims: 'It hurt. I said that really hurt. Pallett then, as fans of the show pointed out, holds her right side as if in pain even though Thomas tapped her on the left side.
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He later spoke to Roxanne and the pair shook hands, apparently drawing a line under the controversy. "Whether you meant to hurt Roxanne or not is irrelevant".
The next episode of Celebrity Big Brother will air on Virgin Media Two / Channel at 10pm on Saturday 1 September.
She also turned other co-stars against Thomas, until they reviewed the footage.
Upon receiving a warning in the show's diary room for breaking show rules, Thomas apologised but said he had not meant to hurt Pallett. My life's in tatters'.
Later on in the feed, Ryan screamed out: 'F***ing get me out of here now!' I don't want this to be our ending, I don't want this to be your ending, I don't want this to be my ending.
In 2008, the actress - who is engaged to Lee Walton - revealed she was emotionally and physically tortured by an ex-boyfriend.
At the time, Roxanne said: "Ow, woman beater!"