Anyone know why my ex swore to never unblock me unblocks me?

He goes periods of having me blocked to unblocking me even tho he swore to me he could never be with me.
I asked for him to keep me blocked for good so it would help me move on and forget him.
But it’s like any time he drink he unblocks me.
I just don’t get it it’s been two years of this all he says he misses about me is sex but why can’t he just keep me blocked?
If he wants me to move on as he told me to move on.
Anyone know why my ex swore to never unblock me unblocks me?
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