Why would my ex block me on facebook but nothing else?

Anonymous
Nearly three weeks since they broke up with me.
They have blocked me on facebook and deleted all their tags from my photos of us.
But not blocked through a messaging app or other social media.

Why would they do that? Any experience?
They unfriended me so I couldn't have seen any photos, posts or their friends list anyway.
Updates
+1 y
Just one ex. A he :p
Why would my ex block me on facebook but nothing else?
3 Opinion