Mlj
I am really sorry that you have to deal with affects of this crap religion, but like some have stated this is normal when you start studying as a JW. You aren't they only one either, unless his family are or become witnesses they will be kicked to the curb as well. These are the beginning steps to isolating him from friends and family so he can more easily become emotionally dependant on the Watchtower organization.
More than ever you need to show him how much you care about him, I would write to him and state that you would never be so cold to a friend. Since you have no choice in his decision you can only wish that if this were to happen that the very least thing he can do for you is to thoroughly research the Witnesses before he commits to baptism.
Wish you the best