I would initially just take it slowly and gauge the situation. If you think he can handle your current situation and status, then tell him details little by little. I told the current person I'm involved with about my illness the second time I met him in person. He accepts me as me. He is not perfect either so we complement each other. It takes time to build a rapport. I would not tell them all at once initially about your illness and situation. It may be too overwhelming.