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How to spot a player
Watch out for over-confidence.
Healthy self-confidence is great, but there's a difference between being confident and being cocky. If you think this guy seems a little too confident in his efforts to win you over, it could be because he's had plenty of practice.
Most people become at least a little nervous around people they're attracted to. A confident guy isn't necessarily a player, but if he doesn't break a sweat while asking you out or seems rather aloof about the whole deal, he might not be that serious about you.