That's actually really thoughtful and kind of you. If you don't feel right sharing his medical condition with people, then just say that you know him well, and you know he's got some really serious, deep issues and that you're really frightened by him right now and you have a strong feeling that he might harm you and others. But if people need to hear the word "schizophrenic" to take your concerns seriously, then so be it.
Good. I'm glad you're wanting to take steps to distance yourself instead of trying to stick around and fix him out of a false sense of loyalty, or whatever. This might be terrible advice, because the sooner you can get him out of your life, the better, but if you're worried about provoking him, maybe you should just tolerate him and keep him at bay until you move in a couple of months.
The second you have all your stuff moved in to the new place, send him a "goodbye" email where you tell him very clearly that you can't be friends and not to contact you anymore (keep it short and unemotional - don't give him anything to misinterpret and grasp onto, and save that email in case you need it) and then just...vanish. You can plan to have your email and phone number changed on the day you move. Let your family/friends/roommates/connections know that they must absolutely not talk to him about you or tell him how to contact you.
But if you feel he's a danger to you like right now, then you're going to have to try something else.