To deal with bad people, those with poor character, dishonest individuals, unpredictable people, and ungrateful persons, it is essential to clearly define the enemy and friend boundaries, completely block them, and sever all contact permanently. This kind of action is very necessary. If you are indecisive and tolerate wrongdoing, you will only dig a hole for yourself, and sooner or later, it will bring disaster to you and the people around you.