Brandi Granville, the estranged wife of Eddie Cibrian, has opened up about the couple’s pending divorce just days after her estranged husband was spotted flirting and golfing with alleged mistress LeAnn Rimes.

“He’s just somebody I don’t know,” the former model remarks of Cibrian’s recent behavior in an interview with PEOPLE Magazine. “I don’t understand. You think you know one thing and you wake up and it’s all been a lie.”

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Eddie and LeAnn met on the set of the Lifetime Original Movie Northern Lights earlier this year. The pair have been dogged by affair rumors since April, when they were photographed by tabloid reporters canoodling outside a Los Angeles bar.

Brandi tells PEOPLE that she has spoken with the country singer, who is also separated from her husband Dean Sheremet, and told her, “He’s all yours.”

Eddie joins the cast of CSI: Miami this fall. The alleged womanizer will play a cop who recently transferred to Miami from Hollywood, California when the eighth season premieres on CBS Sept. 21.