No, don't believe Guddu will ever relapse - he has always remained good at the core and he will remain good - pigheaded and idiotic maybe where his wife is concerned - but he will remain true to his inner nature. He may do stuff that is not kosher to the world and may think he is a law unto himself and think that he can get away with stuff but he is inherently good and conservative and will not do anything to taint his character.