The Cuyahoga County Marriage Index, in its old format which was an excellent source of genealogical information, is no longer online. It was replaced with http://probate.cuyahogacounty.us/pa/TOS.aspxhttp://probate.cuyahogacounty.us/pa/TOS.aspx.
You can search for William's marriage by selecting Search By Party. Then in the Party Role box select Groom and in the Case Category box select Marriage.
There is also a category, Civil/Miscellaneous, but I don't know if that includes divorces.