Gwen Stefani and Gavin Rossdale's divorce after 13 years of marriage has been a surprise to many.

And now, rumors are circulating that the couple's split was purportedly because of Gavin Rossdale's cheating. The Bush lead singer's sexuality was also one of the issues that caused a rift between him and Gwen Stefani, pushing them to resort to divorce.

"The pair have been in counseling for years and Gavin's sexuality was a major part of their sessions, trying to fix these urges he had to be with other men. It was emotionally exhausting for Gwen," a source reportedly told In Touch Magazine.

According to rumors, Gavin Rossdale purportedly cheated on Gwen Stefani with people of various genders, leading to divorce.

"In 2009 Gavin confirmed that he was bi-curious, and had an affair with a cross-dresser named Marilyn for many years before he married Gwen," Celeb Dirty Laundry reported. "Gavin's ex Marilyn revealed that he was still in contact Gwen's husband - and Marilyn believed that the reason they broke up was because Gavin finally came to terms with his sexuality.

"A woman dished to In Touch back in 2002 that she had an affair with Gavin when she met him at a party, and they hooked up and 'engaged in oral sex.'"

However, is there a specific person that caused Gwen Stefani to file for divorce? Perhaps someone from Gavin Rossdale's past, like Courtney Love?

In 2010, Courtney Love revealed that she allegedly had an affair with Gavin Rossdale amid his relationship with Gwen Stefani. Courtney Love admitted the affair casually in an interview with Sirius XM Radio.

"Everyone gave me so much s--- because Gavin sounded like a lot like Kurt...." Courtney Love said on "The Howard Stern Show," as quoted by Us Weekly.

"But man, he was such an Adonis in his day! He got good in bed ... something happened. Maybe Gwen taught him, for all I know."