How do i tell the person that gave me herpes that i have it?

Im soOo depressed because after i carelessly slept with a guy who i have been falling hard for, i instantly got a herpes breakout. I feel like my life is over and just cannot carry this burden by myself. I rarely talk to him now because i've just built up a wall of shame. Today he called and i answered and he exclaimed how he didn't know what he did wrong?, & just I told him i am just really protecting my heart and have been majorly depressed here lately, but i have yet to tell him why. My best friend has over and over arrogantly told me how i need to tell him.. but she makes it sound like it's the easiest thing in the world. Im now a victim of his mistakes and am having to pay the price. And please if none of ya'll have read up on this, then dont answer. It's a very private and personal matter and you just be considered lucky that you havent found that you have it...