No, he never actually hit me, its more subtle than that. The underlying threat of violence. His sexual preferences were unusual, violent, yet he presented them as normal. I knew it wasn't, but I was actually terrified he would cause real harm to me if I refused him.
He stalked me, everywhere I turned, he was there. He stalked my family, threatened them with violence, moved himself into my parents house for a while, he tried to get me into trouble with the police and the benefits agency for things I had not done. Fire was his best friend and he was not afraid to threaten people with it or use it, he did not care what harm he caused.
He was controlling, manipulative and clever. He managed to get one friend on side, and used the information she gave him to cause more harm. Similar to your sis, although said friend is now horrified that she allowed herself to be manipulated, to my detriment.
I can't say much more in case I out myself. His reasons were different to yours. He adored me, was completely obsessed, when I tried to leave he took the attitude that no one could have me. And that obsession turned to hatred.
He tinkered with my car, did something to it to try and cause me to have an accident. It may have worked, except someone saw him messing around with the car and warned me. His hatred ran so so deeply, that I think it would be impossible for him to let go of it in his life time. He was convinced I was a force of evil, in retrospect I think he experienced some sort of psychosis.
I have no doubt that he would try to kill me if he ever saw me again.
Having said all that, it does get easier. I only dream about him a couple of times a year now, and being vigilant isn't that hard, and doesn't take up too much head space these days.
Things will get better. Stay vigilant. And I reckon moving house would do so much more for you in a short space of time, than years of counselling!!