You are a wife
You are a sister
You are a daughter
You are a friend
You have many relationships in your life. You choose how much information you share and with whom. Your relationships = your boundaries.
It appears he is blaming you for ending the marriage and you are feeling guilty.
I do not feel guilty about ending my marriage. I am the dumper. My XH made drinking his priority. He put alcohol before his marriage and children. He was willing to risk everything to keep drinking. I was not willing to risk everything to support his drinking. I made the choice to no longer accept unacceptable behavior in my home and life. For that, I do not feel guilt.