He may be dead - not necessarily indicated on marriage cert.
He may have been missed on census or the returns lost.
He may have been sent to Ireland etc.,
He may never have existed except for the convenience of 'ticking the boxes' on the marriage cert. - Your William Roads Floyd (Married as Wm Floyd Roads) is on 1841 as William Roads 11, with Jemima Floyd 65, William Floyd 20 bricklayer, William Floyd 1, Mary Floyd 30 needlewoman, and Sarah Floyd 20, + James, George & Charles Smith