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Sarah Harding and Chad Johnson began dating in the Celebrity Big Brother house – despite her having a boyfriend on the outside.

Aaron is said to be devasted from having to watch his now ex-girlfriend cheat on him, as she continues to get intimate with The Bachelorette star on camera.

According to reports, the 33-year-old had been dating Sarah for two months after meeting her in a bar.

(Image: WENN) (Image: WENN)

The pair are said to have hit it off immediately and he even moved in with her.

The scaffolder reportedly wasn't bothered about her fame and fell for Sarah for who she really is.

"He's heartbroken. He fell for her," a source told The Sun.

(Image: WENN)

"They were inseparable. He supported her going on Celebrity Big Brother and watched nightly.

"He's devastated she went behind his back."

Aaron – who Sarah claimed she had only been dating for four weeks – has now reportedly moved out of their shared home and back in with his parents in Buckinghamshire.

(Image: WENN)

The source continued: "It's amazing how much this Chad bloke looks like Aaron.

"He's absolutely gutted."

Daily Star Online has contacted Sarah's reps for comment.