Why is my ex ignoring me?

Anonymous
My ex boyfriend says I cheated on him. I still talk to his sister and family. I have a new boyfriend and we've been together for 5 months. My ex boyfriend told his family I cheated on him. Now when I go to the house he ignores me. I have tried to be friends with him. I have not brought my boyfriend around but I will next week. Why is my ex ignoring me? Do you think he will tell my boyfriend that I cheated on him?
Why is my ex ignoring me?
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