I think he liked her but he knew he wouldn’t stick around cause he was about to go study abroad so he choose to not be sincere.. not the best choice.. but come on.. when it comes to relationship people tend to do weird stuff, not everyone is direct and sincere with their feelings and everything..
Then he came back and his college crush calls him.. He thought maybe he got his chance but.. taahhrr > no it’s for business.. who wouldn’t be disappointed ? And why should he help her out of nowhere just because she asked him to ? Business is business.. He did not have any obligation toward her.. duhh