Your obygyn had no business telling you that you didn't have to disclose you have herpes. By not disclosing it, you are being dishonest. Without honesty, you don't have trust. Without trust, you don't have a relationship. Sit down and tell your partner what you wrote here. He can decide what he wants to do. However, he needs to get tested to see if has HSV-1 and/or HSV-2. You could have given him HSV-1 in the genitals from oral sex.
You should insist he use a condom and you should take an antiviral drug so you can reduce the chances of infecting him if he doesn't test postive for herpes. For all you know, he may have it and gave it to you.