My ex has just been kinda rude to me. what should I do?

My ex girlfriend is being a totall, well bitch. I don't like to call girls that but anyways, she is very self centered, and we tried to be friends, but it seems that she is trying to throw it in my face that she is dating other people, and she has just been kinda rude to me. what should I do?
My ex has just been kinda rude to me. what should I do?
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