Genital Herpes!!!

So I've been seeing this guy for about 3 months now. He's literally the best man I have ever come across..Thing is now.. how do I tell him I've had genital herpes since 2011 without him running a mile and more. I'm so scared to tell him but I couldn't forgive myself if I passed it on to him.. Advice please on how soon you told your partner and what the outcome was. Thanks in advance