Dave Grohl’s friendliness towards the opposite sex has allegedly been an issue in his marriage for years — way before he admitted to cheating on his wife and welcoming a baby with another woman. The Foo Fighters frontman, 55, made the shocking announcement last week, in which he dropped the bombshell that he had strayed in his 21-year marriage with Jordyn Blum and impregnated a mystery woman, who recently gave birth to his fourth daughter. While Grohl said he’d do everything to win his wife and children’s trust back, sources spilled that his “flirty behavior” was already a point of contention in his relationship.

Jordyn was allegedly “shocked when she found out about the baby,” an insider told People on Monday, adding, “Her friends are like family, and they rallied around her” following the news. But their marriage hasn’t been picture-perfect. “Dave’s flirty behavior has been a hurdle in their marriage.

It’s been hurtful to Jordyn,” the source alleged. And while fans and Jordyn were surprised about the baby bombshell , the couple’s inner circle wasn’t necessarily shocked. “We keep reading over and over again how heartbroken everyone is because Dave was supposed to be the ‘good guy,’ the rockstar that didn’t have to do those rockstar things,” the insider with knowledge of the situation told People.

“And people are crazy about the guy, but there is a rockstar side.” The Post has reached out to Grohl’s rep for comment. The “Tim.