This is classic abuser behaviour, and classic escalation of abusive behaviours.
He is escalating now because he knows you’re trapped. He’s threatening suicide because he knows it will trap you further.
Start working on an escape plan. Where would you go? What money would you have? Would it be wise to leave while he’s out? Who can be with you to help you leave safely?
Someone else linked you to the Lundy book Why does he do that? I recommend you read it, especially if you are not yet sure that you need to leave.