Yikes. Lets pretend he's a nice guy caught up in a poor circumstance. While in jail, he's developed a pattern of aggressive behaviours (never mind what brought him there in the first place). If he's in seg for fights, he'll very likely get into a physical fight with you over money, living situation, etc.

You can not save him. He's too far under and you'll likely die of an overdose in attempt to cope with his behaviours.. or be killed by his hand.

It's a dead duck! Divorce is the only logical solution to get you started with helping yourself. Sorry! Big hugs to you. You don't need him!!