Are you considering a new sexual encounter"> First you must tell them without apologizing but by being assertive, in an honest and very clear, open discussion about herpes. With so much information out there about discussing herpes with a partner it is usually the consensus that herpes needs to be an unemotional discussion while being very open. How you feel about the disease will come through to your partner as you discuss.
Don't go into the discussion expecting the worst. Don't be over dramatic like saying, “Be prepared, I have something horrible to tell you.” All you need to do is to be informative. Explain about your disease and share everything you know about herpes. For instance, how you found out you have herpes, what the disease is, how you have told others about it, how to avoid spreading it, etc. It may be helpful to practice talking about your herpes with a counselor or a friend. Get advise from your physician to be sure you are understanding all the facts about your disease, how it is transmitted to others, and how to use the best precautions to prevent transference to your partner.
Timing when it comes to telling your partner is everything. Give yourself some time to be sure that your new partner is going to be compatible, a possible mate for you and that you will want to have an intimate encounter with them. Once you have decided this, then have the 'talk' before you become intimate. Having the discussion about herpes is a real mood smasher. Choose your time for the 'talk' carefully. No sexual activity should be involved during this discussion. Sex is probably not going to be an option immediately after the discussion anyway.
Your prospective new lover should have some time to think over what has been said after the discussion. This way they will be an informed consensual partner. Your new potential lover may need to consult their physician first and perhaps do some of their own research.
Being familiar with your knowledge of herpes is going to be important because you will be the first place your potential partner will hear about herpes. Try not to come across to them as a know it all because of your own level of knowledge. Simply share the basics of what anyone needs to know about herpes and leave it be an open discussion. Try to keep control over the discussion because you have some important information to share about how to avoid transference and some medical issues to discuss. More importantly, you want your new potential partner to know you are sharing all this because you feel your relationship has a future.
You may get a reaction of fear on their part but that is why your are discussing all this before entering into an intimate situation. Give them time. It is what it is.