I'm a little bit confused about people's intention

Kindly examine the picture opposite. A woman with the dazzling smile who offered you a sweet from a white paper bag may be a witch. I link this idea with people and stuff around me. For instance, I’m easily enthralled by elaborate small stuff. Then, I have intention to buy them. However, after using them less than ten times, they are broken. These incidents always happen to me. Besides, when I make friends, I always think that if I treat people nicely and well, then I can get good return or reward. However, sometimes the situation is totally opposite and goes beyond my imagination. That is, I get hurt or am betrayed by my so-called good friends. Under this situation, I gradually come to realize that I can’t judge people, even issue from their appearance or cover. I should think twice before making my conclusion.