Man buys lady a drink in bar,sends her ''shocking'' text weeks later

A stunning 18 year old student, Abby Fenton shared screenshot of a message a stranger sent her weeks after they met .She was out celebrating before starting university when a tall man approached he and offered to buy her a drink.
Weeks later, he hit her up,asking her to return the money ..She has not heard from him since she agreed to return it .
Anyone guess why he asked for a refund?