句1：be reluctant to do的意思是不情愿做某事，既然不愿做，原则上就是没有做，除非有特定的上下文。比如：

At first he was reluctant to admit stealing the money, but later he had no choice but to confess when faced with the evidence. 他开始不愿承认偷了钱，但后来在证据面前，也不得不承认了。

句2：reluctantly 是副词作状语，说明agreed时的心态——它表示agreed这个动作发生了，只是“同意“得很勉强。