Hey folks. Remember, sexual assault victims do not always "see" what happened as something they should report. Plus, the act of sexual assault, whether it was merely a failed attempt or sadistically successful, absolutely causes upset and confusion. While I sympathize with this being an unusual place to ask, I think we need to take this seriously.
Sequoia, to answer your question, for all of their misguided beliefs and tactics, JW's have never taught that sexual assault is ok. You are the victim of a predator. Predators are everywhere unfortunately, and frequently use organizations and positions of trust to do as they want. It seems like a coincidence that he is a JW in this case to me, unless his local elders have information on him we are not privy to. I agree 100% with what Steve2 said as well.
Regardless, you should not only report this to the authorities and go to the police, you should get some support from friends and family who will take care to listen to you and help you. I wish you some healing, as this isn't an easy thing to deal with.