A lot of people have issues knowing how to block and unblock friends on Facebook.
The truth is that there are some friendships that go sour with time.
And some people you call good friends may not really be true friends.
They are just there to find a way to pull you down, gain from you or even take advantage of you.
And if they can’t get that from you, at some point they begin to feel they are wasting time being around you then they begin to misbehave.