Thank you! I was sympathetic until I read the original.

OP, please go see a therapist for depression and ptsd. You have had a difficult life and are acting irrationally. Your neighbor didn’t kill your cat. This was an accident. To be brutally honest, you should have kept your cat inside if you knew you’d be away and there was a risk your neighbor would forget to dispose the antifreeze.

What you did was sick. Your neighbor likely felt bad enough as it was already. That cat was your responsibility. I’m sorry you lost your brother and your cat but you really messed your neighbor up and now he could become homeless. Tell your landlord. Figure something out. Your neighbor doesn’t deserve this.