I'm supposed to give my friend John some advice but I'm not sure of how to help him.

He's in love with this lady Kirsten. She's a great person from what he tells me and she is definitely a looker. The problem is she has an STD (herpes). Usually that's a relationship killer, but he's so smitten with her. He asked my opinion and I have yet to find a way to tell him that being with here isn't a good idea health wise but is it my place to say this even though he asked my opinion. What do you think I should tell him if anything at all?

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Deep into that darkness peering,
long I stood there, wondering, fearing,
Doubting, dreaming dreams
no mortal ever dreamed before.