Reality star Brandi Glanville is cheating on her boyfriend by dating another guy on the side, according to Radar Online.

The Real Housewives of Beverly Hills star, 40, has been romantically linked to former Oakland Raiders wide receiver Drew Carter, 31, since July, but a source told the website she is also seeing someone else. The mother-of-two is still dating her on-again, off-again ex-boyfriend Jonathon Ruiz, whom she briefly split from in May.

"They have been on and off for a year," the source said of Glanville and Ruiz, a real estate agent. "Brandi is single and dating... as are they."

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Glanville's relationship with Ruiz will be included in the upcoming season of The Real Housewives of Miami, according to a production insider who said "you will see [this] in the show."

Ruiz works for the real estate agency of Mauricio Umansky, who is married to Glanville's Real Houswives of Beverly Hills co-star Kylie Richards.

Glanville has been talking about a certain ex-boyfriend on Twitter recently, though she never mentioned him by name. She tweeted on Aug. 14 that she is still bothered by an ex-boyfriend, saying, "My Ex boyfriend is driving me insane!!!!"

On Aug. 19 she tweeted, "Dinner with a very handsome kind of ex-boyfriend and then more writing!! #foodbreak."

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Glanville took Carter to the Bravo series' season 4 finale party at the Beverly Hilton on Aug. 9, Enstars previously reported. The outing was considered their fourth date, after they were spotted together earlier in the month and in July out for dinners in Los Angeles. For their third date they went to the Los Angeles restaurant Mercato Di Vetro.

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Real housewives of beverly hills, Brandi Glanville