Verbal abuse

How should I react when he starts verbally abusing me calling me a hoe and bringing up all my flaws and my past should I just respond with positive things and ignore it I’m so sick of arguing going back and forth through txt swearing and name calling, trying to justify all my past actions with explanations I feel like at this point I don’t need to explain to anyone esp a narcissist about why I did certain things bc I made some mistakes in my past but he has made more but always seem to make everything my fault and that I’m the worst person on this planet while he’s an innocent being.

It’s not fair I don’t know what to do anymore I’ve tried leaving so many times but it’s hard I’m mentally ruined