~You see the other guy who also has a crush on the same girl you do commit a villainous crime. Every part of your nature cries out:HERO to you!~
Go protect your girl! She might fall for the bad guy who's going to put her in terrible situations and not treat her well. Even if the other guy was 'good' somehow you just can't live knowing the girl you love might love someone else. And in this way, your inner power is unleashed!