Ex is behaving weird. Hot and cold?

So we have been broken up for some time. She played a lot of mind games after the break up. Flirted with guys in front of me, gave death stares to girls I’m friends with, and many more.

Friday, she was teasing me and talking to me. Also she gave my best friend the death stare too

then the next time I see her, this new girl teases me in front of my ex. Then my ex goes up to one of my best friends (who is a girl that she dislikes and have never spoken too) she tells her she’s been feeling sick and she is sad that her boyfriend moved to New Jersey.

why? This is weird.
Ex is behaving weird. Hot and cold?
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