Why some friendships end - no matter how much you want that friends to last.

Did ya know dat the only danger in Friendship is that it will end.
Why do an friendship end when you need that friendhsip to last? Its a mystry of friendship. As quoted above If there is a friendship it will end at one point or other. But why it is ending when things going perfectly with both friends. Lets see the Insights here as to why friendships end.

Situations face by friends
Simple answer and also commonly accepted answer is friendships end because of the situations the friends are into or even the friends themselves change. mostly all friends will accept this. As time is an important factor for building friendships, Situation is the important factor in end of friendship. The situations faced by two friends may differ from persons. one friend may relocate for higher studies or job can't help but it will affect friendships. The new friends circle formed may make the persons to end the friendships in the past. Does friendships need to end because of these unpredictable changes? Not certainly, but it'll require adjustments that one or both friends may not willing to make.

Friends may Change
Second, the friends themselves may change. A significant reason that friendships often end when friends are apart for an extended period of time (for summer camp, college, etc) is that one or both of the friends change. I think it hurts less when both friends change, because then the breakup is more often mutual and so both friends get closure by both deciding to let go and move forward in their lives without each other. What tends to hurt most is when just one friend changes. One friend might change social circles, become involved in new social organizations, start to date, get a pet, or take on some other venture that consumes more time and passion. Again, a friendship can endure these changes, unless one or both of the friends for some reason decide not to invest the time and energy involved in the adjustment period. (For example, one friend might forget the importance of the friendship due to the high of having a new pet or might feel that the change is impossible to overcome when one gets married but the other is still single.) In this situation, breakups may not be mutual and so one or both friends feel betrayed and end up with bitter memories about what was a precious friendship to them.