Hari singh decided to return the money because he had missed the train and was stuck in the rain. he knew nobody other than Anil. Anil was also going to teach him how to write whole sentences.so, Hari singh returned to Anil..

Hari Singh, the protagonist of the short story "The Thief's Story" by Ruskin Bond, decides to return the stolen money due to several reasons.

1. Guilt: Hari Singh feels guilty about stealing the money from the unsuspecting Englishman, who was kind enough to offer him a job. He realizes that his actions were wrong and immoral, and he wants to make amends for it.

2. Fear: Hari Singh is afraid of getting caught by the police and facing the consequences of his crime. He knows that stealing is a punishable offense and that he could end up in jail if he gets caught.

3. Conscience: Hari Singh's conscience tells him that he should do the right thing and return the stolen money. He knows that his actions have hurt someone, and he wants to make things right.

4. Redemption: Hari Singh wants to redeem himself and start afresh. He knows that returning the stolen money is the first step towards making a new beginning and leading a life of honesty and integrity.

5. Moral values: Hari Singh values honesty, integrity, and morality. He realizes that stealing is against these values, and he wants to uphold them by returning the stolen money.

In conclusion, Hari Singh decides to return the stolen money because of his guilt, fear, conscience, desire for redemption, and adherence to moral values.