Well, my first question is... have YOU been tested?  I only ask because if you're also HSV positive, it's a non-issue.  If you're both negative for all other STDs, you both can have wild, unprotected sex and only have to worry about pregnancy (as long as you both are remaining faithful).  You'd also have to be careful during oral sex so that neither of you caught HSV orally.

If you're HSV negative, then let him know that you still love an accept him.  I'd highly advise against unprotected sex, but let him know that while his HSV is an inconvenience, it's not a hindrance.  You both just have to be cautious of outbreaks, and you have to know and accept that every time you have sex with him, there's a risk.

Also make sure he's well-educated about his disease.  Through suppression medication and condoms, he can drastically reduce any chances of spreading anything to you, with a minimal inconvenience to both of you.  Once his fears are alleviated, and his ego repaired, he should open back up to you.  If he's inconsolable, encourage him to see a specialist to help him get over his unhealthy attitudes about his condition.