I’m new to this and am not exactly sure how

I’m new to this and am not exactly sure how to deal.
My other half is in treatment for meth addiction, which is one of the biggest blessings ever. There have been A LOT of things that happened before him making it there.
As of right now, I’m having a really, really hard time emotionally and mentally dealing with him still blaming me for the choices he made which inevitably caused me to call the police on him. He hasn’t forgiven me for that and began accusing me of things that never even happened.
I’m a wreck and I need help…