If she has a cold sore on her upper lip on the second date, what do you do?

Anonymous
I went out with this very nice girl and hooked up (kissed, massaged one another, and spooned) all night. I asked her out on a second date and she had an open cold sore on her upper lip.

Now, she is really cool, but I have only dated her once prior to the cold sore. Should I stay, or should I go?

I really don't want to hurt her, she's really nice, but I don't want a cold sore (I hope I didn't catch it; I didn't kiss her when she had it). So I figure that if I drop her now with a white lie, she'll be better off.

Please help!
Updates
+1 y
I'm really sorry for sounding like a jerk. I'm just very ignorant about this whole thing and am, thus, seeking help on the matter..the truth is that I am very scared, confused, and don't know what to do (all my guy friends tell me to drop her..)
If she has a cold sore on her upper lip on the second date, what do you do?
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