I agree with KBintheSLC. MissDebbie, congratulations for being a well-informed and well-prepared woman. While I don't think it's absolutely necessary for your boyfriend to understand why you carry, it may help if he can understand that he can't always be there to protect you just as the police can't. That said, I do understand the feeling of wanting him to understand. For istance, I will carry whether my father likes it or not, but I wish he had a better understanding of why.
The world is often a hostile and volatile place, and the best that we can do is to make sure that we are prepared for these situations when they arise.