Firstly, it has nothing to do with intelligence. You are acting like this because you are vulnerable. Just that if you stay vulnerable, neither your life nor your death will be in your control. I never tell anyone not to ctb once they've made up their mind, but in this case I want you to first be free of his influence before you decide what to do with your life, including ending it. Please understand this, it is the root of all evil to control someone, and he is controlling you. Not because he is smarter or stronger, but because you have fear.
Secondly, the fear by which he controls you. I know it is difficult to see it that way when you are in this situation, but nobody in this entire world would think any worse of you EVEN IF he could carry out his threat. You are grown woman, everybody knows you might have sex. If somebody is low, sick, disgusting enough to shoot you and show the video, the only thing that will happen is anybody worth their salt would refuse to look, be disgusted with him, and he will be arrested. That's all. You did not even have consensual sex with him, you were coerced. Again, which means getting arrested for him, and says nothing about your character.
It looks like he is planning on kidnapping you with other people, a criminal organisation. That can mean being a sex slave and tortured all your life. That means it is happening to other women as well. You are in very serious danger. Please, just please get him arrested. Stress the point he has accomplishes, ask for the heaviest protection the system can offer you. Again, once this creep and possibly his accomplishes are arrested, you can decide what to do with your life. But I don't want to see you die in fear and under control.
But please understand there is no 'good side' to him, or ANY SHAME on you. There just isn't. Keep sharing here. How does he read what you write here? Is he a member, or does he just know you're on here?
Be very careful and brave.