My Spouse and i don't have wedding rings. It doesn't serve a symbolic purpose, they have no personal significance, it's not what our relationship is about. I realize it's important to other people but to me it's one of those things i am relieved to not have to keep track of. Besides, i work in a lab so i'd be taking it off all the time. And i don't wear jewelry anyway. It bothers me.
Sorry i don't have anything to say that will make it all better. You've got bigger issues than whether or not he wears a piece of metal on his body. I don't know how you got yourself into this kind of deal, but it seems to me you can do better.