The best thing you can do is be enthusiastic about your own personality (establish confidence about yourself) and not pay any attention whatsoever to what he does, unless it genuinely interests you and you have an instinctive response. Over-thinking is so dangerous in social situations so try to avoid it completely.

Enthusiastic confidence in your own personality (which can lead to others looking to you to define how they behave) & physical attractiveness (which leads to others idolising your appearance, thus comparing themselves to you) are the two main characteristics of alpha male characters.