This can be a sensitive topic and knowing when to raise it is important. It's best to let the friendship develop first, but it's best not to wait until after you've become sexually intimate. Then, the issue can become tangled in feelings of anger and mistrust. Remember, telling a partner about herpes is only a small part of relationship building. This disclosure can enhance your honesty and openness, and demonstrate your ability to have and maintain an intimate relationship.
To find out how to tell your partner about your herpes infection: When to Tell a Partner (American Social Health Association)