Earlier this week, one of Hollywood’s most enduring couples — Gavin Rossdale and Gwen Stefaniannounced their decision to divorce after 13 years of marriage.

And now, In Touch has learned his “wandering eye” and her “jealousy” led to their demise as a couple.

gwen and gavin

“This was a long time coming,” a source close to the 45-year-old No Doubt songstress tells In Touch Weekly.

“Ultimately, it was jealousy that undid the marriage. Gwen accused Gavin of cheating. She was never happy with his wandering eye…and she ended up dumping him.”

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It has since been reported that the 49-year-old Bush rocker had an affair with the woman who once cared for the couple’s three sons, nine-year-old Kingston, six-year-old Zuma and one-year-old Apollo.

Of course, this wouldn’t be the first time a Hollywood marriage has been destroyed by a nanny — check out five other famous husbands who were accused of sleeping with the help!

For more on Gwen and Gavin’s breakup, pick up the new issue of In Touch Weekly, on newsstands now!