😑😑 how do I shut him up

My. Ex I was seeing for five years broken up for five months still gets in touch with me to say he knows I cheated on him 
On my life and my children's I have never ever cheated on him 
This is driving me crazy and depressing me to be accused of such when I've been loyal to his ass for five years 😑😑😑 is there any way to reason I feel like I have to I don't want him thinking this of me. Why do I care πŸ˜«πŸ˜«πŸ˜«πŸ˜–πŸ˜–πŸ˜– I do tho pls help 

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