Same happened to me when I went to see a doctor and she told me I didn't have bad breath. And recently I told one of my best friends and he said he never smelled it. I could not believe it! I was talking to him for about 20 mins trying to get him to confess hes just saying that.
Then I confronted him in a way that I rationally said either I smell bad or Im completely crazy. No middle ground here. I revealed one or two situations where Im absolutely positive I get a reaction from people. After a while conversation went to a 'ok but when u sweat u sometimes start to smell'. (But there also was psychiatrist mentioned as a possible help :)
Before I thought I only had bad breath, now I know I have BO too. Actually I kinda knew about BO (cause my tshirt would smell bad after just one day of wearing) but didn't think it was serious. But I DO HAVE bad breath. I know it. I can see the reactions.
I dont trust my friend, and I think neither should u your husband. It sounds crazy but they want us to feel better. And they dont know how to handle it.
The worst thing is: what is there to gain if I prove them all wrong? I will just reveal all my techniques how I get the info from peoples reactions. And then they will try to hide it even more! The only way to test it is to do a series of intentional or seemingly unintentional 'close encounters' with a number of complete strangers. And then see their reaction...
Sorry for being so pesimistic. If time proves u really dont have BB I will be happy for u :D SO u better come here after a while and tell us the story ;)