Codependency Support Group
Codependency is defined as someone who exhibits too much, and often inappropriate, caring for another person's struggles. A codependent person may try to change, or feel shame about their most private thoughts and feelings if they conflict with the other person's struggles. If you are on a journey towards self-love, this support group is for you. Join us and find others...
It's manipulative to threaten to kill ones'self over a break up. Those are the type to take you with them...
I'd tell him that if that's true, that he needs to get into intense therapy for his suicide ideation. Otherwise, tell him should he decide to do it, at least don't leave a mess.
I'd also see a divorce attorney to put you both out of your misery.
I hope you both don't have kids. That would f them up forever.
Hugs.