First I would like to say I'm truly sorry to hear that your boyfriend is unable to hear quite well with his hearing aids but I do believe he may have a better chance on getting a CI, but before you do anything, talk to him first and see what he wants, it has to be his choice and his alone unless he wants your opinion on this cause sometimes things get heaten up in a relationship when the other side hasn't walked a miles in his shoes yet, as I understand that you're hearing, so to help him is to allow him to decide what he wants to do first and then go from there together as a couple...
I wish you both lots of luck and please do keep us update on this...