Girlfriend doesn't know I know she has Herpes, found medicine bottle... Need advice.

Throwaway for obvious reasons... So here it goes, been seeing an absolutly wonderful woman for the past 8 months, she is 25 and I am 30. We have a really great relationship and I am definitley in love with her. Early in our relationship we had the STD discussion and she told me she was clean, as did I. Sometime during that time I immaturely talked a lot of shit on STDs and how gross herpes was, and how a friend of mine and his girlfriend have it and that his GF was the whore that gave it to him.

Well fast forward to a couple weeks ago, I was in her bathroom and she wasnt home and reached for a little bottle of tylonol she had in her cabinet. Inside there were other pills not tylonol, it was acylvir... I freaked out and I did a bit more looking around and found the actual bottle just hidden, so I know it is her perscription...

Seeing these pills made me do a shit ton of research, and even though i really dont want the virus I am not as scared of it anymore or ignorant about it as I thought I would be. I HAVE NOT confronted her about this, because I am actually scared to lose her. She is a really really great person. I have always been a bit curious before finding them because she always wants to use a condom, and actually mentioned maybe wanting to continue to use them even if we got married, which was a red flag to me. Excuse is "cum in kinda gross".

Anyway I have not mentioned to her that I know, I have a feeling that i destroyed any chance of her telling me because im sure she is afraid that I will leave her because of the things i said in the past. But on the other hand how could she not tell me? I feel betrayed that she would risk it to me because I know 100% (tested) that I do not have it before this relationship. And I have not had an outbreak yet.

I have been calm about this because of how I feel about her, and I am not sure how to talk to her about it. In a way I feel like snooping though her stuff is horrible in inself and im worried ill lose her. Or that this will start some terrible fight that will result in all sorts of issues.

TL;DR Found a medicine bottle with Acylvir (herpes medicine) in Girlfriends house. She doesnt know I know about this, looking for best way to talk to her about this. Please read the whole story if you have time I would appreciate it.

edit: A bit more info, i have gone down on her, and she on me. And we have had sex a a handful times without a condom. Which has always ended with her asking me to stop and put one on at some point. (doesnt want to get pregnant even though shes on BC).

update I had the talk with her about this last night. She came clean. She has it. I have never seen someone so upset and so relieved. She has never told anyone about it. She said she almost told me so many times but thought she would lose me. She says she got it from her ex who cheated on her, and that she was so embarassed that she stayed with him because she felt like she could never find someone new.
Im not sure what to do, angry as I was to find this out I was still sensitive and comforting to her. I know everyone here says to dump her but she is just an awesome person with a lot going for her. She definitly fucked up not telling me about this, putting me at risk and everything. I would really like to stay with her, but the social ramifications of this illness are very unnerving. I suggested to her that maybe we could both go to the doctor and talk to them about getting tested for everything and how to avoid this from happening. She doesnt take meds for it daily and says she has not had an outbreak in a very long time and that the initial outbreak was rather mild. She keeps the meds around in case she gets an outbreak.