Another thought ~ If he does somehow contact you and threaten to kill himself, call the police. They will take him away and he will be held in a facility for a few days until it is deemed he is no longer a threat to himself. And if he is, well, he is now in a safe place. If he wants you to take his threats seriously, show him what seriously looks like. That you will NOT go back to him, so he cannot manipulate you that way. Suicide and its threats is nothing to mess with.
Though I run this site, it is not mine. It's ours. It's not about me. It's about us. Your stories and your wisdom are just as meaningful as mine. 