Paranoid partner

My boyfriend is convinced he is being followed. He accuses me of setting him up and has chased me in his car one day for over half an hour and when I finally pulled up he thought I had someone hiding in my car boot. I was so scared that day I went to the police. The police have since been called twice as it is the only way he leaves me alone - I have never cheated or even entertained such an idea, but he won't listen when I tell him repeatedly there is nothing going on. We went to get dinner Friday night in a drive through but he spotted a random car in the car park and told me I was setting him up - he then chased after the car and I didn't feel safe because I really don't know what he will do or is capable of. I told him repeatedly to take me back to my car which he eventually did only to attack me and accuse me of setting him up and I'm the reason he's being followed and that I had told someone where we going that night when he was with me the whole time I never contacted anyone. I was pushed out of the car, held down and when I finally got up he chased me and threw me in the house and put his hands around my neck. I was only able to leave because police came. He tells me he loves me and he needs to spend more time with me and he will be ok. I am too terrified of what will happen next and I can't see any option of leaving this relationship safely apart from a VRO. Every time I've tried to leave he threatens suicide, I've barely held myself together and this is the first time I've told everyone what's really been happening. Im seeking help through therapy for my own sanity but am too scared to tell him. That's what I've become, a scared shattered human