SO Cell Phone.

So My SO And I Both Have Our Own Phones. Mine Does Not Have A Lock Code Or Any Thing But His Does. He Looks Thru My Phone Every Day To See What I Been Doing Or Talking To, But Doesn't Let Me See His.Every Time He Gets A Call Or Text He Automatically Goes To The Other Room, And When I Bring Up Something About it He Starts Yelling And Threatens To Leave.

Does This Mean He's Cheating?