The only way to leave a relationship that is toxic, is to do what you would do for alcohol with AA….basically…..quit and keep yourself away from that person. Perhaps you might want to go to Codependents Anonymous, too…but honestly, I would just get some therapy first (if you feel you cannot walk out tomorrow.) Strengthen yourself with therapy, just talk to someone. Go to a woman’s center where they usually have free counseling. Find some resources locally on the internet. I’m not Catholic, but Catholic Charities have free or low cost counselling that doesn’t preach to you.
If you cannot leave at this moment (you or the person that you are asking this question for——I’m not meaning to assume it’s you), then get all your ducks in a row:
1. Get counseling to strengthen yourself.
2. Make exit plans.
3. Find a safe place to go.
4. Pack your things quietly and start removing your most important/sentimental things from the house to your safe haven, bit by bit so that on the day you decide to go…you just walk out. Be sure to take all your important documents with you…passport, licenses, birth certificates, bank information.
5. Have a network of support ready for when you leave….because like with a drug, you will want to come back for the first few days/weeks/months.
If you are _not_living with the person, then it is a lot easier….just get counseling and make the decision to break it off. If you can move to another town or another place, I would do that, too. Sometimes, moving is a way to start afresh.
Either way, get some help….and get yourself to a place where you can heal. You are that
important!