My boyfriend won't let me break up with him even though our relationship is destroying my mental health?

I wrote about this guy in quite a few of my recents. Me and him have dated previously for 2 years but then broke it off for 4. I had the hardest time getting over him and I wasn't able to. I struggled so much I ended up suicidal and on antidepressants. I'm not usually like this in relationships at all but he is someone I fell in love with so it really wrecked me.

Me and him met up and we decided to give it another shot. I was very reluctant to give it another chance (admitting to being suicidal and on antidepressants, which he never knew about). He just said it will be fine and that he won't ever do anything to hurt me. Fast forward to 8 months later and he has hurt me so many times. I keep catching him red handed in lies. For example, he used to be involved in commenting on racist blogs but he had told me that he cut that behaviour out a long time ago. One day he left himself logged onto my laptop and I saw his browsing history. Not only did he visit those blogs, he was still active on them after we got back together. When confronted, he tried to lie until I cornered him.

Many of these arguments later and I found myself in a dark place mentally. I had a break down and was having suicidal thoughts, I tried to call him but he was out clubbing with his friend and wouldn't step out to talk. He said his friend told him that if he leaves he won't be going out with him again. Not wanting to lose his friend (someone he knows for way less time than me), he decided to stay in the club.

I did something stupid and I took a bunch of sleeping pills (all that I could find). Luckily I survived (obvs) but the realisation of how toxic our relationship got has really shaken me. I decided to confront my boyfriend and tell him what happened. Without even skipping a beat, he said 'well regardless, we're not breaking up, I'm not letting you leave'.

In all honesty I feel scared, it almost feels like the risk of me dying is inconsequential to him. I don't know how to get away.

My boyfriend won't let me break up with him even though our relationship is destroying my mental health?
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