Just small question for u all :)

Once you break up, why don't you instantly block each other? And if you block that person, what gets into you that makes you unblock them again? like don't you people remember why you broke up in first place?

(Sorry if it seems offensive, but it's totally out of curiosity since I have never been in a relationship. But once I block someone's number, I never unblock them , just by reminding myself why I blocked them in the first place and also never reply back to person who blocked me.)