All people behave in a certain way due to cultures and traditions. They have grown up learning to believe that a certain thing is right or wrong and in turn they pass this on to their children and so on. All of these things play a vital role in shaping our society into what it has become today, some for the better and some for the worse. The bottom line is that human beings end up with the person they are most similar to because that's where they feel they can be