Open Question: Can you get oral herpes from someone who has never had the virus before?

Okay well 2 days ago, (May 21, 2010) I kissed my boyfriend for the first time. It was his first kiss as well as mine. He has never had oral herpes or any herpes at all... because he has never kissed anyone before this and neither have I. He wouldn't lie to me. We're unbelievably close. 2 days before I kissed him, I noticed a pimple-like bump inside of my mouth, in between my cheek and my lower