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. (par3) 2. 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. (par.3) 3. What tends to hurt most is when just one friend changes. (par.3) 4. If week after week passes where plans are made to spend time together but are never honored , perhaps due to taking a friendship for granted , eventually even the closest of friendships may cease to have a reason to exist . (par.4)