My ex thinks that the instagram fake account that curses him belongs to me. Should I explain to him?

I ended our relationship 2 weeks ago. And today a fake account cursed him and he and his friends suspect me because I was the last person he ever argued with. This bothered me quite a bit. Do you think I should call him and explain? I'm sure he will believe me, but I don't know if it's necessary.

My ex thinks that the instagram fake account that curses him belongs to me. Should I explain to him?
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