Pack your things and go. Contact him through your lawyers. Narcissists are poisonous. There is no way to leave such a situation in stages. There is no respectable retreat.
Many women are worried about the possible consequences of such an act.
They usually do not act on them or act half-heartedly so as to fail. The narcissist is autistic. He lives in a world all his own. You exist merely as a reflecting mirror. To think that your leaving would have anything to do with his suicide would be to flatter yourself.