drug addict partner- help leave

I honestly don't even know how I'm writing this.

My partner of six years has officially destroyed me, and somehow I've hit rock bottom instead of him.

Around six months ago, I found out he's using hard drugs. Since then, my life has completely fallen apart. He's constantly manipulating me for money, lifts, and anything else he wants. He's drained my finances, put me into debt, and taken all the enjoyment out of my life.

I know people will probably ask why I don't just leave. Trust me, I ask myself the same thing every single day. I feel like such a fool for staying this long. The manipulation is relentless, and I feel trapped.

When we first met, he was amazing. I genuinely thought I'd found my person. Now, if I'm being completely honest, I wish I'd never met him. I think I hate him for what he's done to me, but I still find it impossible to cut contact.

The hardest part is that I don't even know who he is anymore. I'm terrified that if I leave or block him, he'll just turn up at my door or try to intimidate me. He's never actually threatened me, but he's become such a different person that I don't know what he's capable of anymore.

My mental health is at rock bottom. I'm emotionally drained, financially broken, and I just don't know what to do anymore.

Has anyone else been through something similar? How did you finally find the strength to leave?