Ex deleted me on Facebook within days of adding me back?

I sent my ex a friend request, took him a couple of days but he accepted. Didn’t like my posts but viewed my stories.

He ended up deleting me again about 4 days later.

I’m moving on from the relationship (he dumped me), I just don’t get the need for him to accept me in the first place if he just planned to delete me a few days later?
Ex deleted me on Facebook within days of adding me back?
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