What was Dev's emotional state after the Udyapan, and how did he express his disappointment?

After the Udyapan, Dev was in a state of doubt and disappointment because he believed Sai Baba had broken his promise to attend. As detailed in Chapter 40, despite serving three uninvited guests in person, it never occurred to him that one of them was Baba. Feeling let down and deceived, Dev wrote a letter to Jog to express his sorrow. In the letter, he lamented, "How is it that Baba deceived me? What should I say about His words?... I waited with great effort, but no experience came." This communication shows he felt confused and that Baba's assurance had turned out to be false, leading him to seek an explanation.