I need know does he miss me or what?

My ex has been rude to my guy bsf, he told me my ex and his friend threated him then texted him no one likes my guy friend we’re all being fake to him then he lied on my friend saying he said something but he never did why is my ex doing this does he miss me or what? And should I contact him?
I need know does he miss me or what?
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