Is this weird behavior? What is the sole purpose of it? I don’t get it?

My old guy friend (we don’t communicate anymore who I was intimate with) girlfriend unblocked me & then 4 days later she re blocked me on Facebook. My facebook is public to everybody for reference. She knows me & him have history together but me & him do not speak anymore. I’ve messaged her before due to a situation that she kept involving my name in and she was super bitchy towards me about it. I was no where near rude to her.

He told my guy friend who is also his guy friend that he doesn’t talk to me at all & he was getting away as far as possible from that because a lot has happened but wouldn’t explain anything to him to him then a few days later she unblocked me & 4 days later I noticed I was re blocked.

She unblocked me this past Monday evening & re blocked me this early Friday morning. Never said a single word to me or messaged me.
Is this weird behavior? What is the sole purpose of it? I don’t get it?
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