I agree with Kimmy, she has some wise words there.

Are you in therapy yourself? If not, can you go in for some? Would be helpful to have someone skilled to talk this through in detail and get reality checks. And to help you make sure that you are safe and set good boundaries.

It sucks when people we are close to suddenly change without communicating fully with us, I know that from experience. Best wishes as you go through this.

Sarah