My Wife Is cheating, I confronted her and she called me a wife beater

I found out my wife had been unfaithful from the beginning of our relationship.  When I questioned her about my suspicions throughout our relationship she told me I’m too sensitive and insecure. 

Her mother did the same.  When I confronted her she began to scream and yell "stop hitting me, I can’t believe you hit me" and she even threw herself on the floor. 

She is now going around tarnishing my name.  One of her closest friends contacted me because she felt bad about the situation and told me to be careful because she had done the same thing to an ex. 

What should I do?!