Article continues below advertisementDid Lori Loughlin's close relationship with John Stamos play a part in her separation from Mossimo Giannulli?While rumors swirled Giannulli was the one causing issues in their marriage, an insider claimed he always found the Full House costars' dynamic "too flirty for comfort."Article continues below advertisementWhat Mossimo Giannulli Thought of Lori Loughlin and John Stamos' FriendshipSource: megaAn insider claimed Mossimo Giannulli didn't like that ex Lori Loughlin had 'incredible chemistry' with costar John Stamos.