That was my reality for years as I had bilateral hearing loss and was only fit with one aid initially. The second 'hearing aid' I was fit with was a bicross that transferred sound from the unaided side to the side with the hearing aid. That was long enough ago that I had a wire in the back of my head from transmitting device to the receiving device. Next fit was wireless as technology progressed. Now I have a cochlear implant on the totally deaf side and still use a hearing aid on the other side. It works well.

Your husband may want to look into a bicross hearing aid, or possibly a BAHA (Bone anchored hearing aid) that is designed especially for single sided deafness. A cochlear implant may also be an option.

Unless he wants to get help for this you are probably stuck being his hearing ear doll. Not a problem, but the independence one gains from using technology can be life changing. Definitely; to each his/her own.