Every seller gets a couple of these so you are not alone, people change their minds for a miriad of reasons.

You will never know why??????????????????????

Not worth losing sleep about it, yes it is vexing, but is there anything that you can do about it?

Probably not.

Breathe in, Breathe out.

(Or imbibe of your fav libation)

Accept the cancellation and block block block.

Relist the item and move on.

Good Luck