仔细阅读Para.3,补全以下提纲。 Topic sentence: Friendships often end when one or both of the friends change. A. Supporting sentence: It hurt less when both friends change. Details: The breakup is more often mutual and both friends get closure by both deciding to let go and move forward in their lives with out each other. B. Supporting sentence: What tend to hurt most is when just one friend changes. ( e.g. One friend decides not to invest time and energy in maintaining their friendship because s/he might feel that the change is impossible to overcome when one gets married but the other is still single.) Details: _____________________________________________________________________________.