This is a very shocking thing to hear as the person that has it and as a partner. You have to give him time, even though I know your hurting he needs space and that is one of the things that you could do for him.
The virus is not as horrible as it sounds and people do lead very normal lives. If you have a chance you can read the first thread on this board titled "Happy Couples".
Another thing that you can do is read up on the virus in case he does have questions for you at least you may be able to help answer them.
In the end, if he doesn't feel he can be with you because of this virus then he is not the one for you. There are MANY people out there that are accepting of this virus and that is what you deserve because this does not change you, you are still the same person as you were the day before finding out. Also, if one person is not fully accepting of the virus and you stay in the relationship it will never work out, there can't be limitations on parts of you that someone accepts. If you try to make a relationship like that work someone will be hurt and it normally is the person with the virus.
If you need to vent or ask questions there are plenty of people out here that are willing to help
Keep your head up, it will get better!