Waiting until the third or fourth date to disclose could make him feel as if you are trying to trick him into being with you.
If he is still terrified, let him run and be thankful that you don’t have to live in a world where the boogeyman still exists.
A well-written text message to let him know will often suffice. So don’t waste your time getting to know someone who could potentially be the kind of jerk who would reject you over your status. No matter how lonely you think you may be, a relationship with the wrong person, especially a judgmental person, is always worse. His reasons for running away have nothing to do with you and everything to do with his fears of HIV.
If he has a negative reaction to your positive status and acts like a total jerk, consider yourself lucky to have dodged a bullet. If there is a time to educate, it is in the beginning of a relationship.
There are plenty of good reasons to utter the words “let’s just be friends” after a first date.