How to re-add friends (Loop-hole in the bug?)

I wish to re-add someone, and I can't at the moment as I have him glitched into my friend list. I have him on my list, but he doesn't have me on his. I know there is a method which allows you both to re-add each other. If anyone knows it, post here. Thanks.

I have tried deleting and re-adding several times. And we have used friend invitations through friend search. Still no go.

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