A relationship between human beings will always create the conditions for the next trip. There is a difference in the condition where a time will enter a period of unpleasant or difficult times but in these conditions will be tested whether people can still continue the relationship or decides to terminate.
In pleasant conditions friend or friends will be a pleasant place, and conditions that can make us happy or unhappy. why because certain things sometimes passes the limits in our thinking.
So to get a lasting friendship that we have to be clever to care for and maintain the situation.