He wasted the time of a potential employee, and made her feel very uncomfortable with unprofessional behavior. Plus, he admitted that what he was doing was wrong - presumably against company policy, as well as in general being a shitty thing to do.

From a pure "what's good for the company" consideration alone, at the very least someone from HR needs to have another talk to him about what's acceptable or not - he could be driving away other potential employees, and setting the company up for lawsuits.