Then just don’t engage. Don’t explain anything. You said you are leaving abusive marriage. Explaining reasons or argue with abusers is a losing game. Doesn’t matter if you don’t trust him or don’t love him. Reasoning isn’t required. Explaining to a manipulator why you want to be divorced leads to him explaining why you reasons are wrong. It’s never ending pointless cycle. You can’t win it

“I don’t want to be married and want to get divorce, I’ll file for it asap”. That’s all you need to say. It sounded to me as you present him with argument for divorce and he doesn’t agree and than you’ve been going back and forth adding more reasons and trying to get him to agree. He can’t weaken you if you don’t engage. He doesn’t hold the power.

I’d also talk to abuse advocate what to do if he doesn’t leave you alone, like if he keeps you up at night being loud trying to argue. That falls into abuse category.