When Gwen Stefani and Gavin Rossdale confirmed last night that they were divorcing after almost 13 years of marriage they said it was a "mutual decision," but now it seems things were not quite as straightforward as the pair have made out.

A new report today claims the long-term couple, who have three children together, split because Gwen suspected Gavin had cheated on her. The break-up was a "long time coming," a source told TMZ.

But Gavin's possible infidelity is not the only reason for the rockers' shock split. It's thought Gwen hated that her husband was away from home so much, especially earlier this year when he left to tour with his band Bush for over three months.

No Doubt frontwoman Gwen "put pressure" on Gavin to stay at home more, according to TMZ's source, something he resented considering she had often had long spells away with her own work commitments.

Gwen cited "irreconcilable differences" in her divorce filing, and asked for joint custody of the pair's three children, nine-year-old Kingston, seven-year-old Zuma, and one-year-old Apollo. As the pair did not sign a prenuptial agreement before getting married, they are each entitled to half of their communal property, which means that Gwen's estimated $80m (€73m) and Gavin's estimated $35m (€32m) will most likely all be split down the middle. 

The music industry couple began dating back in 1995 when No Doubt supported Bush on tour. They married seven years later in London's Covent Garden, and would have celebrated their 13th anniversary next month. 

Gwen and Gavin's marriage has not been without its ups and downs, however, Their marriage his a rocky spot in 2004 when it was revealed that Gavin had a fourteen-year-old daughter, Daisy, from his relationship with UK designer Pearl Lowe, who he dated before meeting Gwen.

DNA tests confirmed Pearl's suspicions that Gavin was indeed the father of Daisy, now a 26-year-old model.

Earlier this year Gwen got emotional on the TODAY Show as she discussed her marriage and spoke how "proud" she was of it. "If I look back on the whole thing the one thing that's been constant is that we both want the same thing," she explained.

"We both want to be married. We both want to be good parents, and so I feel really proud of what we've done together."