Educate yourself about abuse. Start here:
The "dance" with an abusive partner: https://samvak.tripod.com/abusefamily.html
But what actually constitutes abuse? https://samvak.tripod.com/abuse.html
When Parents are the abusers: https://samvak.tripod.com/faq5.html
The dynamics of an abusive family: https://samvak.tripod.com/narcissistfamily.html