Why was Dev suspicious when the Sanyasi returned to Dahanu so soon?

Dev was suspicious because the Sanyasi's return contradicted their previous agreement. As narrated in Chapter 40, Dev had specifically told the Sanyasi to come back after two to four months to seek donations, as another collection was already in progress. However, the Sanyasi reappeared in about a month. This premature return made Dev doubt the Sanyasi's intentions, causing him to wonder, 'Did he forget what was said earlier?' This discrepancy was the primary root of Dev's suspicion regarding the early visit.