In the text Why DoFriendships End?, we know what hurts most in a friendship is when both friends change.

In the text "Why Do Friendships End?", it is mentioned that friendships can end due to various reasons, and one of the most painful situations is when both friends undergo changes that affect the friendship1。However, the specific statement "what hurts most in a friendship is when both friends change" is not directly mentioned in the provided references. Instead, the text suggests that friendships may end due to a lack of common interests, lack of time, mismatched expectations, betrayal, feeling one-sided, inability to repair after conflict, romantic involvement, and perceptions of friends and family2。These factors can lead to a friendship feeling draining, frustrating, or causing one to feel bad about oneself, which can negatively impact mental health and well-being2。

Additionally, the text also discusses the concept of ambiguous loss, which refers to the struggle to process the end of a friendship without closure or a clear reason why it ended4。This can be particularly challenging when the friendship's end is not mutual or desired by both parties6。For instance, when one or both friends start dating or get married, the friendship may come to an end, and it tends to hurt the most in such situations6。

In summary, while the text does not explicitly state that both friends changing is the most painful aspect of a friendship ending, it does highlight various factors that can lead to the end of a friendship and the emotional impact of such endings.