First of all, let me remind you this: this man exchanged vows with you. He's with you, in sickness and in health. For better or for worse. As long as you both shall live, not "as long as you don't have HPV". HPV is one of THE MOST COMMON STIs! 80% of the population is estimated to have it at sometime or another, most just won't develop symptoms. You really should start off my explaining that to him. It's really not related to promiscuity. You can sleep with ONE PERSON, and get HPV. It does not mean you were a "busy girl" (even if you were -- it's really nobody's business.. not even your husband's!). You need to make sure he understands, it's not a result of promiscuity. It's a result of sleeping with ONE person who had no symptoms.. there was no way for you to know. ALSO, condoms don't protect against it... so even if you were safe, it's still contractible sexually.
As for LEEP & fertility -- from what I've read/been told, it doesn't affect "fertility" or ability to conceive directly in most cases. What it does, is weaken the uterus so that labour can be difficult.. it can cause problems near the end of the pregnancy that are very treatable and easily managed in most cases. You really should direct these kinds of questions (since they are specific to your body and where the LEEP is being done) towards your OBGYN, but in general, LEEP is not associated with inability to conceive. I have actually never heard of anyone having completely impaired fertility by LEEP.. only by hysterectomy.
Try not to stress too much. If you can speak openly and honestly with your husband about this, it will be one less thing for you to worry about! Be prepared to answer any questions he might have, but just be honest (to the extent you're comfortable with). He's your husband for a reason, he wants to support you through this kinda stuff. Just give him a chance! I know it's scary -- but he can probably already tell something's on your mind. If not (because men aren't the most observant creatures) he will still be relieved to know you're comfortable sharing these kinds of issues with him, I'm sure.
Good luck with your procedure, I hope the "talk" with your husband goes smoothly! He has the potential to be a good support system for you through this, so give him a chance.