Can you explain why Dev felt deceived by Sai Baba after his Udyapan ceremony?

Dev felt deceived because he had invited Baba to his Udyapan ceremony and Baba promised to come, but Dev did not recognize Him when He arrived. As detailed in Chapter 40, Dev waited with great effort but saw no sign of Baba as he knew Him. Although he served a meal to an uninvited Sanyasi and two companions, his mind was clouded by a "veil of Maya." Believing the promise was broken, he wrote a letter to Jog stating, "it all turned out otherwise; I don't understand this at all." His disappointment stemmed from his failure to perceive Baba's presence in the Sanyasi's guise.