My heart completely goes out to you. Unfortunately it is true he is instructed to avoid you at all costs for his own spirituality's sake. For the past few years the society has taught that we need to befriend the householder and listen to them. (we were so hard core to avoid bad associations it was hard for me to even listen to anything personal the householder would bring up). But anyone expressing doubt causes the jw to become paranoid about exploring those doubts. We are told doubting is a subtle form Satan uses to destroy our faith. He may be scared by your findings because they are repressed ones he has been wrestling with himself.
When I expressed to my best friend (fellow jw, same age, best friends since youngsters) my doubts, she was there to encourage me to study. For awhile. Then she told me that my doubts had caused her to realize she needed to make sure she was solid in the faith so that she wouldn't be in the same situation. Conversations became fewer ( we talked 3-4 times a day on the phone-kids the same age, did EVERYTHING together as much as possible although living long distances apart). They eventually stopped. I have written her. We are not d'f or d'a yet though she knows we are celebrating holidays. I haven't heard a peep from her in the last few months. I had to hear through the grapevine she is pregnant! With her first she called me in the middle of night to tell me as soon as she found out! What a drastic cut off. You are not alone. This behavior is preached from the platform at every kingdom hall. I have no idea what you could say to change his mind. I do agree though that since you are unbaptized, a sincere plea to go over one topic at a time in an effort to "help you understand" is about the only way. However that may be handed off to an elder or ministerial servant so that your friend doesn't feel his spirituality threatened if he doesn't feel strong enough to refute your doubts or has them himself (which he would NOT admit). If this is the case, even though you "study" with someone else your friend may still be wary and guard himself from associating with you. Those not baptized, though studying for years are always associated with and included in hopes they will see the organization as a loving environment and take a stand through baptism. But doubt them or show them their error and you are the devil.
Best wishes to you. Hopefully your friend will reflect on you and your knowledge and not cast you aside in his heart or mind. You may have just planted the seeds of doubt that get things turning in his mind and regain your friend in the end.