What a tough situation for your poor friend to be in! On one hand that's great that he was honest enough to tell her. That must have been such a difficult conversation to have regardless of what end of the conversation you're on.
On the other hand I can completely understand her not being sure in regards to if she wants to keep seeing him or not.
I wonder if it would help her to go & see a doctor & find out exactly what all of this would mean for her if she were to pursue a relationship with him?
If I was her, I would want to know if had protected sex, what would be the chances of her catching it? If their relationship goes well, would they ever be able to have unprotected sex or try for kids down the track?
It would be scary to find out that your partner had this but I hope she is able to make an informed decision with accurate information.
What would really scare me or put me off would be the potential of catching it yourself & having to deal with the ongoing health complications from it, especially if their relationship doesn't work out.