If he is threatening suicide he needs to be hospitalized. If he is refusing to go on his own, its time to call the cops and get him committed. Yeah, this sounds like I'm being a hard @ss, but suicide is not something to be taken lightly. EVERY threat must be treated seriously.

And, you need to put yourself first. If he is this unwell and not willing to help himself, there is nothing you can do. He is a sinking ship and taking you down with him. If anything, he is being the selfish one....can you see that? He has no right to take you down with him. Its total BS for a friend to say you're being selfish for leaving him when he is being an abusive arse. I don't care what the disorder is, that doesn't give him the right to treat you so horribly.

We aren't responsible for being traumatized or developing PTSD, but we ARE responsible for our own healing. If we can't even help ourselves this much, then I don't think we deserve to have others in our lives. That is, trauma/PTSD doesn't give anyone a free license to be abusive toward others. (Clarification....symptoms such as flashbacks, dissociation, and other things that we can't fully control aren't what I'm talking about.)