<human>: Alright, I'm currently freaking out a little bit and I'd like to know if I have good reason.

Before meeting my longtime gf about five years ago, I had unprotected sex with a one night stand (believe me, I know it is incredibly stupid). I had an STI test performed several months after, and then another about two years after the incident, both coming out clean. As a result, I never felt the need to bring this up with my current gf. 

However, I was just recently reading up on STIs, and realized that the HPV virus cannot be tested for in men. Now I'm horrified that I may be carrying this dormant virus from my one night stand, since it is a highly prevalent STI, and have passed it on to my current gf, with whom I've had regular unprotected sex. 

I'm absolutely mortified that I may have passed this infection to her, and she may develop cervical cancer as a result. What do I do? Should I tell her about my previous encounter so she can get tested? I read that, for women under 30, HPV usually goes away naturally, and that HPV testing is not typically recommended unless her pap smear shows irregular results.

Any advice on what to do here? I feel like a serious piece of shit for potentially having exposed my gf to an infection.

Can you provide a brief overview of the text?
<bot>: I had unprotected sex previous to my current relationship, but got clear STI tests. Is it still possible I have passed on the HPV virus to my gf, and if so what should I do?