You’ve bruised his ego by rejecting him in favor of sexual agency. Society says that is a corrupt thing for a woman to do, which provides the means of lashing out for the perceived insult.

Beyond that I would have to speculate too much about his state of mind. It could be sexual conquest. It could be genuine heartbreak. Men’s egos are often fragile at young ages, and frequently they don’t know their own minds.

Even if you were so inclined, that would be creating a precedent for tolerating such treatment, and that would be unhealthy all the way around.