She's a nurse with HPV? She didn't use protection? Or get tested? Does this have to be reported to her work as she is in the health field? That would stink for her.
I would suggest first of all that you immediately begin to use protection with H. I know you love him, but if and when you ML, you cannot trust him. You said yourself he is not making you feel as if it is really over. Next time, it may be HIV. What if he goes out and has a one night stand.
I'm not talking very DB here, I'm sorry. I'm not trying to get you all worked up. But, this is your life you are talking about. Don't throw it away.
In the meantime, perhaps H will take this in stride. Is there a chance he already knows? Perhaps he has lesions and was afraid to tell you?
Maybe he will see this as what it is. A dangerous choice he made on his part that cannot be repeated because he is putting his life and your life in danger with these choices.