Is this mentally unstable?

It only toke someone 4 months to show there true colours. Sorry if this is a long read. Back in January I met a guy, hit it off well, I think me at this stage of my life I felt lonely because my baby passed away in 2019. I felt vulnerable but I let myself feel like that. Fast forward 2 months, he wasn’t sleeping.. and I thought that was totally odd because normal people sleep right? Well, he was flatting with a friend and she had cameras in her house (very odd I know) and she grabbed me when he wasn’t around one day, and said my partner has been taking woman back there when I wasnt around, but it was never to his room is was to the garage, witch again I found it odd. I confronted him and he lied and lied and lied, he said “what fucking girl(s)” playing sooo dumb and i seen it with my own eyes on the camera recording. I finally got it out of him that he was smoking crack with his girl mates in the garage!! I lost my shit, if I hate one thing I HATE drugs, I’m the type of woman who will tip your drugs out, smash your smoking utensils (weeds ok tho) I’ve been in many relationships were crack was abused and I was nearly killed multiple times because the crack made them have two voices in there head. Anyway I talk to him about it, and I express my pure hate for drugs. He understood and said he will stop, well it never did. He ended up moving to another friends house, and my god, he is the most mentally abusive male I’ve met! I’ve had physical and mental abuse in my short life and hands down I would rather physical abuse than mental abuse because you heal from the physical abuse faster. He would accuse me of cheating, when I stayed at his house I was never allowed to face the wall in bed on my phone because I was a “cheating scum cunt” who was hiding something, he said to me in these words “your band from facing the wall” he treated me like his puppet, if he said or wanted something I had to buy it or do it, in the end not a day went by when he didn’t abuse me or accuse me, I become really close to his flatmates partner but I’ve had to cut contact with her because I just can’t be around him and I don’t want him to know my personal life. There is so so so much more to the story. But he’s physically unstable and mentally ill. I wasn’t allowed to go out, if I did he expected me to have a time limit. He was recently put on home d for drink driving. 😡 I honestly don’t know how I treat him like shit, my intentions have never been bad, I don’t hide my phone from him, I just choose to not give it to him otherwise I’d never get it back, because he has the huge ordeal with me and my phone??

I’ve walked away, and I don’t miss him, but I’m scared for another woman? What if he hurts another female?? I’m so so scared he will because he’s definitely capable of it. My question is what do I do???

This is only a short version of the story so the messages I’ve put bellow might not make to much sense to ya’ll but this was the type of shit I put up with daily. HE SAID I WILL STOMP ON THERE HEADS IN FRONT OF THERE KIDS IN ONE MESSAGE!! 😕