Postmaster's Actions
The postmaster in Rabindranath Tagore's short story does display some selfish tendencies when he decides to leave Ratan alone without any support or guidance.

Abandoning Ratan
After forming a close bond with Ratan and becoming a father figure to her, the postmaster abruptly leaves the village without informing her. This act of abandonment shows a lack of consideration for Ratan's feelings and well-being.

Selfish Motives
The postmaster's decision to leave Ratan alone can be seen as selfish, as he prioritizes his own desires and needs above hers. Rather than considering how his departure would affect Ratan, he chooses to pursue his own goals without any regard for her feelings.

Lack of Empathy
By leaving Ratan without any explanation or support, the postmaster demonstrates a lack of empathy towards her situation. He fails to consider the emotional impact of his actions on Ratan, showing a disregard for her feelings and vulnerability.

Conclusion
In conclusion, the postmaster's actions in leaving Ratan alone can be viewed as selfish due to his lack of consideration for her well-being and feelings. His decision to prioritize his own needs over hers showcases a disregard for empathy and compassion towards another individual.