And how were you helping him by staying and suffering?
I'm sorry you have to go through all this, but really, how would you have HELPED him?
If he is suicidal, he should be professionally evaluated. If he's not suicidal, he's manipulative. Either way, you can't do anything for him, yourself.
He can survive unemployment. He will be better if he treats his alcoholism. Either way, it's up to him, not you.
Have you been to Al-Anon?