I feel responsible..

So me and this girl from work have been talking for about 3 weeks now, and I really REALLY like her! I have 1 son from my previous engagement and he loves her. But I just found out that I was exposed to HSV-2 from my ex that cheated...I got tested right after our relationship ended and everything came bck negative...I'm scared I'm gonna lose her and what's worse is that if I have it she might have it too because we have had sex...*ugh* I feel like shit...I told her and she took it well...but still I think she might drop me. What should I do?