What is wrong with some people?

This guy lied to me, cheated on his wife with me, was controlling, jealous, and whenever he got mad at me (for no reason) he would ignore me for a few days and he is telling people I was the problem.. he is talking shit about me yet I bought him stuff, was caring, patient, loving and I never once started an argument and when he was mad I calmed him down. I was so proud of how great of a girlfriend I was but he is posting all these passive aggressive things on snapchat and facebook and instagram saying I am a liar and treated him badly. How do I deal with him and his friend spreading lies about me?
What is wrong with some people?
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