Small white growth on roof of mouth

Hello, 

I got my wisdom teeth out a week ago, when I went in for my post op appointment my dental sugeron said that I had a growth on the roof of my mouth and that I need to have it removed and sent away for biopsy.  He mentioned that it looks like a papilloma.  

I’m a bit confused as I though papillomas were all HPV.  I have been with the same person for 12 years and to my knowledge he does not have it.  So how would I have gotten it? 

It’s causing some stress between us as he now thinks that I have cheated on him. 

I am looking for some explanations on how I could have gotten it, if this is even what it is. I have an appointment with my regular doctor on Monday. 

Any ideas what else it could be? Does not feel like a bone piece as it’s moveable