No. This has never happened to me.
The longest friendship I had was for 6 years before he disappeared without saying a word. But he didn´t block me. And neverteheless I don´t regret this friendship because we had 6 good years.
And the other longterm-friendship I am having here will do whatever but certainly won´t block me. None of the friends I´ve ever had here has ever blocked me. That´s just childish.