What would the world's classiest woman do in this situation?
She would do nothing, she would let this roll off her back because she knows she's better than that. She wouldn't care what other people thought about him bashing her and her father.
Don't give him a reason to justify in his mind that he made the right choice by cheating and leaving. He WANTS you to make it easy for him by acting crazy.
Be cool and calm. You're in pain now, he will be later.
