One more thing to add here: If you are in a serious and committed relationship with this guy and you have strong feelings for him, then you should tell him something. Should he ever find out that you knew and did not tell him, the distrust would be too large to overcome. If it results in him leaving you, then so be it. Like I said, he could have infected you. Most intelligent men will understand this.
It is up to you whether to tell him or not. I've had doctors tell me that I do not have to say anything. Other doctors have said I should, morally. I make this decision based on the feelings I have for the person I am seeing and their sexual past. Any man who has had "well over 5 women" has it. You could not avoid it too. It is a skin disease and even people who only have safe sex get it. Yes the odds of cancer are very low. However, if you both lead unhealthy lives, the odds do increase.
You should use this test result as a wake-up call to eat healthy, exercise often, stop smoking if you do, reduce drinking, take vitamins and supplements, reduce stress and increase rest. He should do the same.
The bottom line is you have no idea if he gave it to you or if you gave it to him. And that is the way to aproach this if you decide to tell him. At least you can be tested. Us men have to remain clueless, get a wart or depend on our lovers to tell us the bad news. Should you tell him, explain the statistics of getting it and of getting cancer from it. Educate him on it and he will probably keep loving you since he could have been the carrier and he could have infected you.