What is why would someone block you then unblock you?

There could be various reasons why someone would block you and then unblock you.

They may have blocked you in a fit of anger or frustration and then had a change of heart later on. Alternatively, they may have wanted to take a break from social media and subsequently unblocked you when they returned.

Another possibility is that they used the block feature to get your attention or to make a point, and then unblocked you once they felt they had gotten their message across.

It's also essential to keep in mind that sometimes people block or unblock others accidentally, especially if they are using the app while distracted or in a hurry.

Overall, without more context or information, it's impossible to say precisely why someone may have chosen to block and then unblock you.