So first - have you had genital symptoms? Were you diagnosed only by blood test or because you had symptoms?
You are only infectious from the site of your infection, which I'm assuming is your genitals. That means you can give oral sex and not transmit it.
You say the new guy is "healthy" - do you know that for sure? Have you seen any test results? Have you had any conversations with him?
The thing to know about having herpes is that you can transmit without symptoms. This is because of asymptomatic viral shedding. This is when the virus is present on the skin without symptoms. Because you've had it for so long, you are probably shedding about 17% of days if you are having outbreaks, and 9.3% if you aren't.
The odds of transmission are probably lower than you think, too. As a female, the odds of transmitting it to an uninfected male are about 4% a year. Using Valtrex reduces that by about half. Condoms used by uninfected men while having sex with infected women reduce the risk of transmission by 30-50%.
Telling him should be part of an overall STD conversation. Unless he's a virgin, he has the possibility of having STDs. You need to know about those.
Let me know what questions you have. :)