Good or Stupid?

What is the difference between someone good and someone stupid? I don't know how to put it in words but i can give you an example. Someone comes to you, asking for your help. It could be anyone. Family, friends... You try to help them anyway you can. After some time they come back and they ask for your help again. Since you helped them once, you can't say no. What happens if they come back again asking for more? You help them again and again and again and again. When they don't need you, they don't know you. When you need help no one's there. If they need something, they'll come straight to you. Even if you are in a bad situation they will still ask something from you. And as a stupid human that you are you help them again. You're not good my friend, you are stupid! Now that you are in need, where are they? Do they know you? Oh here they come again! They want something again. But you are in no position to help them. You say No and what happens? They spit on you like you're the worst person in the world. They hate you for it regardless of what you've done for them so far. Now please answer me the first question...