From All kind of relationships...in the teen Stage, Friendship is the Most common reason for anyones changes in Life...
Well for examples...when friendship leads to love and if they happened to depart..then love and friendship both are over...isn't that hard to bare..?.

And If someone gets to know that his or her friend was cheating on him or her in friendship...like pretending as friends...then the disappointment..???
It's not hard to lose a Good Friend..It's easy...you just end up the friendship....But when it is done so...it's hard to gain it...

And also...none will be able to fill someone's space...bcoz everyone is different..
People change when their are no friends around..or else if the loved ones are away from...One friend is more than enough to change someones whole life...
Positively and Negatively...