Why does a narcissist break up with you then go out of their way to play games and throw mixed signals?

Has anyone else experienced a narc like this? He breaks up with you, then gets jealous you are seeing other people, calls you crying then doesn’t care , then cares, then wants to be friends, then doesn’t, blocks and unblocks, ignores you then talks to you …

I don’t understand what the motive behind this is.
Why does a narcissist break up with you then go out of their way to play games and throw mixed signals?
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