It establishes the tone for an adult relationship. A decent guy will respect and care for you, listen to you, and be there for you, something a terrible boy would not do. In order for a relationship to endure and grow, the decent guy will make it worth your time and will not waste it. He will cherish and respect your time. Decent guys are hard to find, but when they do come along they are worth fighting for. They are loyal and honest, and will never hurt your feelings even if they have every right to. They will always try to improve themselves and be responsible with their actions. They will never abuse their power over you and will always keep their promises. They are just plain good people. The bad guy will use you up and throw you away. He will start out as the perfect boyfriend/girlfriend-zany jokes and cute gestures, but eventually you will realize that he is only using you until he finds someone new. He will treat you like crap and never give you any reason to hope that things will change. If you happen to break up with him, he will cry and complain about how much he loves you and wants to get back together, but in the end he will never change. The decent guy on the other hand will always remain constant. Even through all of your mistakes he will still love and protect you. He will never tell you what you want to hear just to make you stay with him.