Toxic situationship destroying my mental health yet I can't walk away?

I've known this guy over 2 years. We dated consistently for a while, long story short his dad committed suicide and things turned toxic and inconsistent after that. I gave him the benefit of the doubt because of his trauma.

We ended up not speaking for several months because I was self harming due to how rubbish he was making me feel.

he then came back into my life a few months ago and I really hoped he’d have changed but no he;s worse than ever.

Expects me to be available for him but never there for me. It is completely one sided and he treats me like a sex doll. It’s making me very unwell again but I can’t walk away because. I love him and he’s entwined in my life by being a family friend and neighbour.
Toxic situationship destroying my mental health yet I can't walk away?
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