[PSY]

I'm glad you've recognized this is a dangerous relationship to be in. First things first, check out this article I wrote on protecting yourself from abusive individuals. It discusses how to obtain restraining orders/orders of protection, as well as whom to inform if you feel threatened by someone.

You cannot be held responsible for what another person decides to do (or not do). He clearly needs help, and it's up to HIM to get that help for himself. You would in no way be responsible for anything he does in an attempt to hurt himself. Right now, you need to focus on getting help for YOURSELF. If/when the proper authorities get involved, they can probably send someone to contact him and provide him with resources... but it is not YOUR job to "save" him.