Why is my ex copying me?

I decided to ignore my ex boyfriend’s behavior but after seeing him twice recently in person (him obviously not looking at me) I’ve realized he’s been copying me. If I post something on insta, he does something similar shortly after. It’s little things like that, that make me wonder out of curiosity. Why? He broke it off. He got distant. He has a new girlfriend. He’s been hot and cold.
Why is my ex copying me?
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