Gwen Stefani may appear to have moved on from estranged husband Gavin Rossdale now that she had confirmed dating Blake Shelton, but she will never forget what he allegedly did to her.
According to Radar Online, the 46-year-old singer believes that the 50-year-old rockstar is cheating on their former nanny - and she even has proof of their romance.
A source close to the songstress revealed that Gwen was approached by some of the members of their household staff after the Grammy Awards because they think that Gavin was getting close to their children's nanny.
"There were several times that Gavin was caught hanging out with the nanny when the kids weren't around," the insider said. "They were extremely flirty with each other, and would go for long drives, alone."
Apart from the eyewitnesses' claim, Gwen Stefani was able to gather evidence that Gavin Rossdale has been cheating on her.
"There were text messages that Gwen also found on Gavin's phone that she thought were very incriminating," the insider said.
The No Doubt lead singer confronted the English musician about his affair with their former nanny.
"Gavin continued to deny it at first, but finally confessed he had been seeing the woman away from the kids," their source said. "There was no way to deny it any further. The nanny had worked for the family for two years."
According to the website, Gavin Rossdale's relationship with the nanny is already over but it was just too late to save their marriage because Gwen Stefani had enough.
During a recent interview with Ryan Seacrest, the "Used To Love You" hitmaker described her divorce.
"My life blew up in my face," she said as reported by ET Online.
The rocker couple claims that their divorce was a mutual decision and they cited irreconcilable differences as the reason. However, the Bush frontman says it was Gwen Stefani who cheated on him with Blake Shelton.
According to FOX News, Gavin Rossdale believes that the two kept their romance a secret because she's scared that he might demand more money in the divorce if she's proven to have had an affair.
