Call the cops if he makes another suicide threat. If he is bluffing, he will hesitate before trying that tactic again. If he isn't, then you have put him in the hands of people far more capable of handling it then you.
I know what it feels like to want to rush to get out of a situation, but you have to try to not let that affect your judgment. You still need to make the best decisions for you in the long run, even if it entails some short-term discomfort.
Very sorry things went this way, Mischa, even if it isn't totally out of the blue.