Can anyone help me?

My ex boyfriend always tries to start drama with me and always tells me how I’m a horrible person and how I’m a problem. He always texts me out of no where and I never try to start anything with him. We have a lot of the same friends and when they don’t invite me to do something he brags about it. I don’t know what to do because sometimes he acts like he hates me but other times he tells me that i’m a great person and that i don’t deserve to get treated like shit.
Can anyone help me?
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